[OKDXA] Mini Tribanders at low heights

Nelson Derks ac5up at windstream.net
Mon Sep 21 13:48:23 EDT 2009


John Geiger wrote:
> I know that is below the real minimium height to get such an antenna to play on 20. So here is my question-is it really worth the expense and effort to put a mini antenna at that height?

Optimum height is generally considered half a wavelength above RF ground 
(which in some cases is slightly below the Bermuda grass) and that's 35' 
on 20 Meters. But... There are plenty of OM's making Q's on 40 and 80 
where the optimum height thing ain't happenin' for them, either. 
Assuming the G5RV is also at 25' the advantages of a mini beam would be 
improved forward gain along with the possibility of reducing noise 
coming off the back side. The noise reduction concept is more often the 
difference between Q / No Q than forward gain so I'd say there is an 
advantage.

Can't say if that would be worth it to you, but it wouldn't be a 
complete waste.



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