On Wed, 02 Dec 2009 20:26:45 +0100, Sjouke Burry
wrote:

mm wrote:
On Tue, 1 Dec 2009 14:35:23 -0800 (PST), whit3rd
wrote:

On Nov 30, 11:46 pm, mm wrote:
One more antenna question: Antenna pitch?

That is, my attic has a pitched roof and the antenna for channels 7 to
60 that I'm thinking of now is almost 13 feet long.
Yes, it matters; the main part of that long antenna is 'director'
elements, which create a kind of shadow on the active
dipole. The rays get past if you aren't roughly lined up with
the line-of-sight to the transmitter.

Also, such a long antenna has high 'gain' which means it
MUST be aimed carefully; how can you possibly adjust it
if it's bumping into the roof?

I may be confused about what "gain" is. Why would a high gain antenna
have to be aimed carefully? If it has high gain, it seems like it
would have some gain to spare if it were badly aimed.

If it had low gain, it seems like it would have to be aimed precisely.

High gain means "narrow bundle" , so a high gain antenna needs
careful aiming.

So what aobut people on mountains and in valleys, where the
transmitter is lower or higher than they are. Should their antennas
be tipped down or up to aim at the transimitting antenna?

I never hear anyone recommend that, and afaicr (and I don't spend much
time near mountains, but some), every outdoor antenna I've ever seen
has been horizontal.