Has anyone any good suggestions for a group A aerial which:-

a) Can withstand the weight of many severely obese pigeons.
b) Can prevent pigeons from perching on it.
c) Has a high gain.
d) Can withstand high winds.

The last replacement log periodic super high gain aerial was pigeon
destroyed within 6 months and I've had to go back to my 40 year old
original, which I proofed with cable tied plastic bird deterrent strips
to a limited extent. It is a real pain getting out the scaffold tower to
bugger about with aerials and I'd like to find a solution which lasts.

In article ,
Capitol writes:
Has anyone any good suggestions for a group A aerial which:-

a) Can withstand the weight of many severely obese pigeons.
b) Can prevent pigeons from perching on it.
c) Has a high gain.
d) Can withstand high winds.

The last replacement log periodic super high gain aerial was pigeon
destroyed within 6 months and I've had to go back to my 40 year old
original, which I proofed with cable tied plastic bird deterrent strips
to a limited extent. It is a real pain getting out the scaffold tower to
bugger about with aerials and I'd like to find a solution which lasts.

I've not had any trouble with the TV aerial (lots sit on that waiting
for the birdfood to go out), but they cause a problem when they sit on
the weather station, spining round and round, or stopping it spinning,
depending which bit they sit on.

I used long tie-wraps on that, with the long tail sticking up and cut
into a point on the end. Can't do it on the spinny bit, but they've
given up now they can't sit on the rest of it.

For the aerial, you might also try something like fishing line runs
from the top of the reflector to the end element. Don't know how UV
resistant it is - maybe some other material would be better. Anything
you add will increase the wind surface.

My neighbour's aerial flips between horizontal and vertical
polarisation, depending which side of it a bird last sat on!

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On 20/02/2014 11:29, Capitol wrote:
Has anyone any good suggestions for a group A aerial which:-

a) Can withstand the weight of many severely obese pigeons.
b) Can prevent pigeons from perching on it.

Fishing line monofilament or thin cable ties glued on to make it
unpleasant for them to land on - about 4" long ought to do it.

c) Has a high gain.
d) Can withstand high winds.

The last replacement log periodic super high gain aerial was
pigeon destroyed within 6 months and I've had to go back to my 40 year
old original, which I proofed with cable tied plastic bird deterrent
strips to a limited extent. It is a real pain getting out the scaffold
tower to bugger about with aerials and I'd like to find a solution which
lasts.

How did the pigeons destroy it? Dielectric material in the works or do
you have heavyweight pigeons with lead divers boots in your area?

We regularly get birds on our aerial and it has never made a noticeable
difference to its functionality. I sometimes lose satellite lock in high
winds and torrential rain but the TV aerial soldiers on fine.

--
Regards,
Martin Brown

I don't know but I now have problems with bloody Parakeets who seem to think
that aerials are for cleaning and sharpening beaks.
Brian

--
From the Sofa of Brian Gaff Reply address is active
"Capitol" wrote in message
...
Has anyone any good suggestions for a group A aerial which:-

a) Can withstand the weight of many severely obese pigeons.
b) Can prevent pigeons from perching on it.
c) Has a high gain.
d) Can withstand high winds.

The last replacement log periodic super high gain aerial was pigeon
destroyed within 6 months and I've had to go back to my 40 year old
original, which I proofed with cable tied plastic bird deterrent strips to
a limited extent. It is a real pain getting out the scaffold tower to
bugger about with aerials and I'd like to find a solution which lasts.

On Thu, 20 Feb 2014 11:29:50 +0000, Capitol wrote:

The last replacement log periodic super high gain aerial was pigeon
destroyed within 6 months and I've had to go back to my 40 year old
original, which I proofed with cable tied plastic bird deterrent strips
to a limited extent.

If that worked on the old one, why wouldn't it work on the new one?

Alternatively, cable tie the end of a cat's tail to the new aerial, so
that it's got enough reach to get the pigeons wherever on the aerial they
are?

Martin Brown wrote:
On 20/02/2014 11:29, Capitol wrote:
Has anyone any good suggestions for a group A aerial which:-

a) Can withstand the weight of many severely obese pigeons.
b) Can prevent pigeons from perching on it.

Fishing line monofilament or thin cable ties glued on to make it
unpleasant for them to land on - about 4" long ought to do it.

c) Has a high gain.
d) Can withstand high winds.

The last replacement log periodic super high gain aerial was
pigeon destroyed within 6 months and I've had to go back to my 40 year
old original, which I proofed with cable tied plastic bird deterrent
strips to a limited extent. It is a real pain getting out the scaffold
tower to bugger about with aerials and I'd like to find a solution which
lasts.

How did the pigeons destroy it? Dielectric material in the works or do
you have heavyweight pigeons with lead divers boots in your area?

Heavy weight pigeons squabbling. Destroyed the plastic fixings for the
aerial elements. Couldn't take the loading.

We regularly get birds on our aerial and it has never made a noticeable
difference to its functionality. I sometimes lose satellite lock in high
winds and torrential rain but the TV aerial soldiers on fine.

Huge wrote:
On 2014-02-20, wrote:
Has anyone any good suggestions for a group A aerial which:-

a) Can withstand the weight of many severely obese pigeons.
b) Can prevent pigeons from perching on it.
c) Has a high gain.
d) Can withstand high winds.

IME, one that's in the loft.



I've been considering it.

Adrian wrote:
On Thu, 20 Feb 2014 11:29:50 +0000, Capitol wrote:

The last replacement log periodic super high gain aerial was pigeon
destroyed within 6 months and I've had to go back to my 40 year old
original, which I proofed with cable tied plastic bird deterrent strips
to a limited extent.

If that worked on the old one, why wouldn't it work on the new one?


I want to buy a designed product which works, not have to rework a new
aerial.

Alternatively, cable tie the end of a cat's tail to the new aerial, so
that it's got enough reach to get the pigeons wherever on the aerial they
are?

Neighbours cats are proving hard to persuade.

In article ,
Capitol writes:
Martin Brown wrote:
How did the pigeons destroy it? Dielectric material in the works or do
you have heavyweight pigeons with lead divers boots in your area?

Heavy weight pigeons squabbling. Destroyed the plastic fixings for the
aerial elements. Couldn't take the loading.

Then buy a better quality aerial.
One without cheap plastic holding the elements on.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On Thu, 20 Feb 2014 11:29:50 +0000, Capitol wrote:

It is a real pain getting out the scaffold tower to bugger about with
aerials and I'd like to find a solution which lasts.

6" to 8" UV resistant cable ties (black) around the main spar spaced
at 4" with the "tail" sticking upwards.

--
Cheers
Dave.

On 20/02/14 12:05, Brian Gaff wrote:
I don't know but I now have problems with bloody Parakeets who seem to think
that aerials are for cleaning and sharpening beaks.

Aren't they?

--
Ineptocracy

(in-ep-toc-ra-cy) €“ a system of government where the least capable to
lead are elected by the least capable of producing, and where the
members of society least likely to sustain themselves or succeed, are
rewarded with goods and services paid for by the confiscated wealth of a
diminishing number of producers.

Andrew Gabriel wrote:
In articlegtqdnQSqp8WnYZjOnZ2dnUVZ8qidnZ2d@brightvie w.co.uk,
writes:
Martin Brown wrote:
How did the pigeons destroy it? Dielectric material in the works or do
you have heavyweight pigeons with lead divers boots in your area?

Heavy weight pigeons squabbling. Destroyed the plastic fixings for the
aerial elements. Couldn't take the loading.

Then buy a better quality aerial.
One without cheap plastic holding the elements on.

It was not cheap. Price is no guarantee of suitability unfortunately!

Why should the customer have to redesign the product by adding cable
ties etc?

Capitol wrote:
Has anyone any good suggestions for a group A aerial which:-

a) Can withstand the weight of many severely obese pigeons.
b) Can prevent pigeons from perching on it.
c) Has a high gain.
d) Can withstand high winds.

The last replacement log periodic super high gain aerial was pigeon
destroyed within 6 months and I've had to go back to my 40 year old
original, which I proofed with cable tied plastic bird deterrent
strips to a limited extent. It is a real pain getting out the
scaffold tower to bugger about with aerials and I'd like to find a
solution which lasts.

..22 Air rifle resolves the problems a) and b) - and gives you free meat as
an extra! ;-)

On 20/02/2014 12:05, Brian Gaff wrote:
I don't know but I now have problems with bloody Parakeets who seem to think
that aerials are for cleaning and sharpening beaks.
Brian

Global warming again shock horror

Capitol wrote:
Has anyone any good suggestions for a group A aerial which:-

a) Can withstand the weight of many severely obese pigeons.
b) Can prevent pigeons from perching on it.
c) Has a high gain.
d) Can withstand high winds.

The last replacement log periodic super high gain aerial was pigeon
destroyed within 6 months and I've had to go back to my 40 year old
original, which I proofed with cable tied plastic bird deterrent strips
to a limited extent. It is a real pain getting out the scaffold tower to
bugger about with aerials and I'd like to find a solution which lasts.

http://www.ebay.co.uk/itm/like/11119...f13=80&ff14=95

http://www.amazon.co.uk/BirdBan-Anti.../dp/B005BU97UI

Bill

In article ,
Capitol writes:
Andrew Gabriel wrote:
In articlegtqdnQSqp8WnYZjOnZ2dnUVZ8qidnZ2d@brightvie w.co.uk,
writes:
Martin Brown wrote:
How did the pigeons destroy it? Dielectric material in the works or do
you have heavyweight pigeons with lead divers boots in your area?

Heavy weight pigeons squabbling. Destroyed the plastic fixings for the
aerial elements. Couldn't take the loading.

Then buy a better quality aerial.
One without cheap plastic holding the elements on.

It was not cheap. Price is no guarantee of suitability unfortunately!

Why should the customer have to redesign the product by adding cable
ties etc?

If you ask in one of the technical TV newsgroups, someone who
knows might tell you a good make to buy. I bought mine from CPC
about 10 years ago, and I went for one which looked like a
reasonable quality one. I had scaffolding around the roof at the
time - didn't want it to fall to bits after a couple of years
when I no longer had easy access. It might have beeb Antiference
(looks similar to their current models).

As it happened, 3 years ago I had scaffolding up around the
chimney and took the opportunity to more accurately align it
with a satnav and protractor, and it was still as good as new.

Interestingly, having aligned it, I stood on the chimney and
looked in the direction, and I could just about make out the
transmitter on the horizon, which was some 25-30 miles away.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

On 20/02/2014 20:44, Andrew Gabriel wrote:
In article ,
Capitol writes:
Andrew Gabriel wrote:
In articlegtqdnQSqp8WnYZjOnZ2dnUVZ8qidnZ2d@brightvie w.co.uk,
writes:
Martin Brown wrote:
How did the pigeons destroy it? Dielectric material in the works or do
you have heavyweight pigeons with lead divers boots in your area?

Heavy weight pigeons squabbling. Destroyed the plastic fixings for the
aerial elements. Couldn't take the loading.

Then buy a better quality aerial.
One without cheap plastic holding the elements on.

It was not cheap. Price is no guarantee of suitability unfortunately!

Why should the customer have to redesign the product by adding cable
ties etc?

If you ask in one of the technical TV newsgroups, someone who
knows might tell you a good make to buy. I bought mine from CPC
about 10 years ago, and I went for one which looked like a
reasonable quality one. I had scaffolding around the roof at the
time - didn't want it to fall to bits after a couple of years
when I no longer had easy access. It might have beeb Antiference
(looks similar to their current models).

As it happened, 3 years ago I had scaffolding up around the
chimney and took the opportunity to more accurately align it
with a satnav and protractor, and it was still as good as new.

Interestingly, having aligned it, I stood on the chimney and
looked in the direction, and I could just about make out the
transmitter on the horizon, which was some 25-30 miles away.


That may work but in built up areas its more important to line up the
nulls in the aerial pattern with the reflections.
You can't generally do that with a protractor.
Its also difficult with digital, you have to use signal quality not
strength.

Strangely, I do not possess a beak so cannot tell you!

Brian

--
From the Sofa of Brian Gaff Reply address is active
"The Natural Philosopher" wrote in message
...
On 20/02/14 12:05, Brian Gaff wrote:
I don't know but I now have problems with bloody Parakeets who seem to
think
that aerials are for cleaning and sharpening beaks.

Aren't they?

--
Ineptocracy

(in-ep-toc'-ra-cy) - a system of government where the least capable to
lead are elected by the least capable of producing, and where the members
of society least likely to sustain themselves or succeed, are rewarded
with goods and services paid for by the confiscated wealth of a
diminishing number of producers.

No escapees from a local collection now breeding all over the home counties.
they are green and hang around like bunches of yobbos squawking.
Brian

--
From the Sofa of Brian Gaff Reply address is active
"newshound" wrote in message
o.uk...
On 20/02/2014 12:05, Brian Gaff wrote:
I don't know but I now have problems with bloody Parakeets who seem to
think
that aerials are for cleaning and sharpening beaks.
Brian

Global warming again shock horror

What in a conservation area?
Luckily myself I don't need much of an aerial here, but some folk down in
Kingston do, and its here that the feathered Karate Parakeets get them, or
the overweight pigeons do.
A friend told me Magpies have been trying to repossess his o f late as
well.
Brian

--
From the Sofa of Brian Gaff Reply address is active
"Dave Liquorice" wrote in message
ll.co.uk...
On Thu, 20 Feb 2014 11:29:50 +0000, Capitol wrote:

It is a real pain getting out the scaffold tower to bugger about with
aerials and I'd like to find a solution which lasts.

6" to 8" UV resistant cable ties (black) around the main spar spaced
at 4" with the "tail" sticking upwards.

--
Cheers
Dave.

Or 50,000 volts between the boom and the elements?

Brian

--
From the Sofa of Brian Gaff Reply address is active
"Bill Wright" wrote in message
...
Capitol wrote:
Has anyone any good suggestions for a group A aerial which:-

a) Can withstand the weight of many severely obese pigeons.
b) Can prevent pigeons from perching on it.
c) Has a high gain.
d) Can withstand high winds.

The last replacement log periodic super high gain aerial was pigeon
destroyed within 6 months and I've had to go back to my 40 year old
original, which I proofed with cable tied plastic bird deterrent strips
to a limited extent. It is a real pain getting out the scaffold tower to
bugger about with aerials and I'd like to find a solution which lasts.

http://www.ebay.co.uk/itm/like/11119...f13=80&ff14=95

http://www.amazon.co.uk/BirdBan-Anti.../dp/B005BU97UI

Bill

dennis@home wrote:

Interestingly, having aligned it, I stood on the chimney and
looked in the direction, and I could just about make out the
transmitter on the horizon, which was some 25-30 miles away.


That may work but in built up areas its more important to line up the
nulls in the aerial pattern with the reflections.
You can't generally do that with a protractor.
Its also difficult with digital, you have to use signal quality not
strength.

If the tx is visible it is extremely unlikely that the aerial will need
to point in any direction other than straight at it.

Bill

Capitol wrote:
Has anyone any good suggestions for a group A aerial which:-

a) Can withstand the weight of many severely obese pigeons.
b) Can prevent pigeons from perching on it.
c) Has a high gain.
d) Can withstand high winds.

The last replacement log periodic super high gain aerial was pigeon
destroyed within 6 months and I've had to go back to my 40 year old
original, which I proofed with cable tied plastic bird deterrent strips
to a limited extent. It is a real pain getting out the scaffold tower to
bugger about with aerials and I'd like to find a solution which lasts.

Google bird spikes

Bill

On 21/02/2014 23:37, Bill Wright wrote:
dennis@home wrote:

Interestingly, having aligned it, I stood on the chimney and
looked in the direction, and I could just about make out the
transmitter on the horizon, which was some 25-30 miles away.


That may work but in built up areas its more important to line up the
nulls in the aerial pattern with the reflections.
You can't generally do that with a protractor.
Its also difficult with digital, you have to use signal quality not
strength.

If the tx is visible it is extremely unlikely that the aerial will need
to point in any direction other than straight at it.

Bill

You have never seen ghosting as an aerial installer?

On 22/02/2014 08:32, dennis@home wrote:

You have never seen ghosting as an aerial installer?

You missed the change to digital transmission? Ghosting is a thing of
the past. With COFDM modulation, reflections within the guard interval
contribute useful signal.

--
Andy

Huge writes:

On 2014-02-20, Capitol wrote:
Has anyone any good suggestions for a group A aerial which:-

a) Can withstand the weight of many severely obese pigeons.
b) Can prevent pigeons from perching on it.
c) Has a high gain.
d) Can withstand high winds.

IME, one that's in the loft.

I didn't quite expect satellite internet (and TV) to work when I set up
a test rig near a window inside the house, but it did.

Now (after the high winds) I wonder why I didn't leave it there.....

--
Windmill, Use t m i l l
J.R.R. Tolkien:- @ S c o t s h o m e . c o m
All that is gold does not glister / Not all who wander are lost

In article om,
dennis@home scribeth thus
On 21/02/2014 23:37, Bill Wright wrote:
dennis@home wrote:

Interestingly, having aligned it, I stood on the chimney and
looked in the direction, and I could just about make out the
transmitter on the horizon, which was some 25-30 miles away.


That may work but in built up areas its more important to line up the
nulls in the aerial pattern with the reflections.
You can't generally do that with a protractor.
Its also difficult with digital, you have to use signal quality not
strength.

If the tx is visible it is extremely unlikely that the aerial will need
to point in any direction other than straight at it.

Bill

You have never seen ghosting as an aerial installer?

No, just multipath reflections;!...

--
Tony Sayer

Bill Wright wrote:
Capitol wrote:
Has anyone any good suggestions for a group A aerial which:-

a) Can withstand the weight of many severely obese pigeons.
b) Can prevent pigeons from perching on it.
c) Has a high gain.
d) Can withstand high winds.

The last replacement log periodic super high gain aerial was pigeon
destroyed within 6 months and I've had to go back to my 40 year old
original, which I proofed with cable tied plastic bird deterrent
strips to a limited extent. It is a real pain getting out the scaffold
tower to bugger about with aerials and I'd like to find a solution
which lasts.

Google bird spikes

Bill

Thinking of building myself one of these later on this year. Back to
front depth is under 7cms and it can be mounted hard up under the eaves.
Horizontal polarisation.

http://www.wikarekare.org/Antenna/doubleBiquad.html

On 22/02/2014 08:56, Andy Wade wrote:
On 22/02/2014 08:32, dennis@home wrote:

You have never seen ghosting as an aerial installer?

You missed the change to digital transmission? Ghosting is a thing of
the past. With COFDM modulation, reflections within the guard interval
contribute useful signal.


And just how far out does it need to be before it becomes noise?

On 22/02/2014 19:00, dennis@home wrote:

And just how far out does it need to be before it becomes noise?

Miles. For all UK DVB-T and -T2 implementations (8K mode with 1/32
guard interval fraction and 32K mode with 1/128 GI) the guard interval
is 28 us, equivalent to 8.4 km path difference.

--
Andy

dennis@home wrote:

If the tx is visible it is extremely unlikely that the aerial will need
to point in any direction other than straight at it.

Bill

You have never seen ghosting as an aerial installer?

Dennis, you are clearly a fatuous pigheaded know-all fool who will learn
nothing from the explanation below, but I give it for the benefit of others.

Leaving aside the fact that there is no ghosting with digital TV, the
fact is that the idea of putting the aerial off beam to minimise
multipath reception is largely a myth. It's a hangover from the VHF 405
line days when most aerial installation was done by trial and error. It
very rarely worked, even then; the most it achieved usually being an
adjustment to the phase relationship between the direct and indirect
signals (because the dipole was moved across the two wavefronts as an
accidental consequence of the rotation of the array), this changing the
polarity of the second image.
For UHF reception the situation is different for two major reasons.
Firstly we are receiving four or more signals on different frequencies
on the same aerial. This means that the technique of adjusting the
aerial so a null faces the unwanted reflected signal is useless because
the nulls are in different positions for different frequencies.
Secondly, a UHF aerial is much more directional than a VHF one. This
directivity means that if the aerial is off-beam the strength of the
signal received directly from the tx is greatly reduced. Since multipath
is caused by the ratio between the strengths of the direct and indirect
signals being inadequate, and not simply by the strength of the
reflected signal, an off-beam aerial is already highly unlikely to
combat multipath without other factors being considered.
I can honestly say that in 45 years the number of occasions when I have
found that leaving an aerial off beam has been beneficial has been
something like three, and these have been in places where reception has
been so utterly hopeless and the direct path so totally obstructed that
aerial alignment has been more or less arbitrary, with reflected and
diffracted signals coming from a multiplicity of directions, many of
them at closely similar strengths. In a case like that it is a matter of
choosing which reflected signal to point the aerial at. Reception can
never be satisfactory or reliable. Think in terms of a cottage in a deep
valley, surrounded by trees and with very large buildings all around, or
think of a low rise building in a city completely overwhelmed by the
surrounding high rise.
There is one situation that I exclude from my assertion that the aerial
is always aligned on the direct signal. It's unusual, but I guess I've
seen it about a dozen times. It's when the direct signal is completely
obstructed, and thus isn't, in practical terms, there. There is only one
significant refection (this condition is why the situation is unusual).
The result is that the reflected signal is much stronger (infinitely
stronger, possibly!) than the direct signal or any other reflected
signals. In that case the aerial will be aligned on the reflection. Note
that this is not a case of aligning a null on the reflected signal but
of aligning the forward lobe on it. In these cases it is often possible
to screen the aerial from directions other than the desired one by
buildings (mount it low) because the reflection is coming from a high
building not so far away, and this is visible perhaps even from the ground.

OK then Dennis, now go boil your head.

Bill

In article , Capitol
scribeth thus
Bill Wright wrote:
Capitol wrote:
Has anyone any good suggestions for a group A aerial which:-

a) Can withstand the weight of many severely obese pigeons.
b) Can prevent pigeons from perching on it.
c) Has a high gain.
d) Can withstand high winds.

The last replacement log periodic super high gain aerial was pigeon
destroyed within 6 months and I've had to go back to my 40 year old
original, which I proofed with cable tied plastic bird deterrent
strips to a limited extent. It is a real pain getting out the scaffold
tower to bugger about with aerials and I'd like to find a solution
which lasts.

Google bird spikes

Bill

Thinking of building myself one of these later on this year. Back to
front depth is under 7cms and it can be mounted hard up under the eaves.
Horizontal polarisation.

http://www.wikarekare.org/Antenna/doubleBiquad.html

Should work quite well that unless your area id rather compromised for
levels.

Least it's a bird unfriendly design...
--
Tony Sayer

Capitol wrote:

Thinking of building myself one of these later on this year. Back to
front depth is under 7cms and it can be mounted hard up under the eaves.
Horizontal polarisation.

http://www.wikarekare.org/Antenna/doubleBiquad.html

In general these designs have a very broad forward lobe, which is bad if
there's CCI from +/- 45deg of the tx. For instance, Rowridge reception
from somewhere to the north of the tx.

I'm sceptical of the gain claim. Commercial products of that sort of
design don't achieve that across the band.

Bill

In article , Bill Wright
scribeth thus
Capitol wrote:

Thinking of building myself one of these later on this year. Back to
front depth is under 7cms and it can be mounted hard up under the eaves.
Horizontal polarisation.

http://www.wikarekare.org/Antenna/doubleBiquad.html

In general these designs have a very broad forward lobe, which is bad if
there's CCI from +/- 45deg of the tx. For instance, Rowridge reception
from somewhere to the north of the tx.

I'm sceptical of the gain claim. Commercial products of that sort of
design don't achieve that across the band.

Bill

Who makes them Bill?...
--
Tony Sayer

In article , Windmill spam-no-
lid scribeth thus
Huge writes:

On 2014-02-20, Capitol wrote:
Has anyone any good suggestions for a group A aerial which:-

a) Can withstand the weight of many severely obese pigeons.
b) Can prevent pigeons from perching on it.
c) Has a high gain.
d) Can withstand high winds.

IME, one that's in the loft.

I didn't quite expect satellite internet (and TV) to work when I set up
a test rig near a window inside the house, but it did.

If it can "see" the satellite and the glass is RF transparent, and not
all are, then yes it will work..



Now (after the high winds) I wonder why I didn't leave it there.....

...
--
Tony Sayer

tony sayer wrote:

I'm sceptical of the gain claim. Commercial products of that sort of
design don't achieve that across the band.

Bill

Who makes them Bill?...

Now you're asking. There's a lot that are similar but have two or four
stacked dipoles (nominally full wave). There are at least two makes that
have the double diamond active element, both European. I have some
pictures. I'll dig them out tonight.

Bill

Bill Wright wrote:
tony sayer wrote:

I'm sceptical of the gain claim. Commercial products of that sort of
design don't achieve that across the band.

Bill

Who makes them Bill?...

Now you're asking. There's a lot that are similar but have two or four
stacked dipoles (nominally full wave). There are at least two makes that
have the double diamond active element, both European. I have some
pictures. I'll dig them out tonight.

Bill

Just a footnote, I've used double biquads centre connected to 1/4 wave
sleeves, without a reflector, slipped over rubber duck aerials, to
boost transmit and receive range of 2.4GHz systems. Changes polarisation
from vertical to horizontal and improves directionality. A very simple
mod to do.

Capitol wrote:
Bill Wright wrote:
tony sayer wrote:

I'm sceptical of the gain claim. Commercial products of that sort of
design don't achieve that across the band.

Bill

Who makes them Bill?...

Now you're asking. There's a lot that are similar but have two or four
stacked dipoles (nominally full wave). There are at least two makes that
have the double diamond active element, both European. I have some
pictures. I'll dig them out tonight.

Bill

Just a footnote, I've used double biquads centre connected to 1/4 wave
sleeves, without a reflector, slipped over rubber duck aerials, to boost
transmit and receive range of 2.4GHz systems. Changes polarisation from
vertical to horizontal and improves directionality. A very simple mod to
do.

Can also be used in the other orientation which retains vertical
polarisation.