On 17/07/2010 23:26, Andrew Gabriel wrote:
In articleApidnbxV2O74ud_RnZ2dnUVZ7tmdnZ2d@brightvie w.co.uk,
.uk writes:
Being a white stick radio operator, I have to find someone to put the
antenna up on the chimney stack for me, but before I do, I need some advice
please.

If you get an aerial installer to do it, get the advice from them.

If he is a radio amateur as I am, our aerials demand different mountings
than do TV ones. Lightening and static during a storm can take out the
front end of a receiver in a flash. Pun intended

Obviously, a small pole needs to be attached to the chimney stack so that
the antenna which is a glass fibre aerial weighing 0.9Kg can be fitted just
above the stack itself. Neither I nor my neighbour have chimney pots.

I would estimate that the pole would be overall about 3 feet long and then
the antenna fitted at the top of the pole to clear the stack.

Should I use 1 or 2 lashing kits to hold the pole.

That seems quite small compared with many TV aerials, although I
have no idea what shape, and more importantly, wind resistance
the glass fibre aerial has, but providing it's not large, one
lashing kit should be fine.

This is one of the unknowns. For amateurs, wind resistance calculations
are well known. A TV aerial installer will have no knowledge of this.
Our aerials that work from 50 Meg to 70 centimetres can be quite wide
and bulky. Thus giving a much higher wind resistance than expected.

Dave