The simple way to find out is to model it on Eznec/4nec2 etc...

In my mind a HF yagi will never be quite high enough and there will be
multiple lobes at differing takeoff angles. Changing the boom angle to
the horizontal will tend to change where these lobes point so one would
experience a change in gain to stations at specific distances. How much
difference I dont know because I dont have a handle on how critical the
refraction angle is through the ionosphere.

Cheers Bob VK2YQA



Caveat Lector wrote:
Had an experienced Ham claim that rotating an HF yagi in the elevation plane
would give significant signal gain on some signals.

Never heard of such a thing

Comments please