Hello, Ian.

Yes, I was a bit hasty in citing Moxon.

But thinking a little more about this I wonder. Intuitively, and looking
at Moxon's sketch, it would seem that the effect would be simply to
rotate the vertical pattern by the amount of the slope. Aiming the
pattern "down the slope" rather than "toward the horizon" does not seem
to be a necessarily worse situation as Moxon suggests. Wouldn't that
actually put more energy out toward the horizon?

Tilting a VHF ground plane antenna toward the horizon would be different
because the vertical pattern at zero degrees is not attenuated by ground
losses.

Chuck








Ian White, G3SEK wrote:
chuck wrote:


Don't know from personal experience, but Les Moxon, author of HF
Antennas for all Locations, seems to believe it creates an advantage.
You might want to read his thoughts on that.


The advantages of which Moxon wrote are for *horizontal* polarization
only. If the antenna height above ground is correct, the ground
reflection can reinforce low-angle radiation in the downslope direction.

But Moxon also shows specifically that there are *no* such advantages
for vertical polarization. The ground-reflected ray is lost at a high
angle.