On Wed, 20 Mar 2002 20:33:06 -0500 Don Havlicek <n8de@thepoint.net>
writes:
> I agree with VE9AA who said you should 'tune' the antenna with the
> reflector on the ground and pointing straight upward, but NOT
> leaning against a metal support [tower, etc.].
Actually, there is still some 'ground effect' when aiming the
antenna straight up. The Lower the antenna F/B, the greater
the ground effect, i.e., the higher the reflector needs to be
above ground to prevent such ground effects. There was
a table published in QST (and Handbooks?) showing
minimum height vs F/B. If my poor memory serves me,
something like 10 ft for low F/B and maybe 5 ft for high F/B
for the high bands.
Tom N4KG
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