[Antennas] 40 m vertical beam

[Don Havlicek]

As has been mentioned often both here and in TowerTalk, insulate both 
from ground and phase them with a remote switch to reverse the phasing.
No coils/capacitors required.
Don
N8DE

ARDUJENSKI at aol.com wrote:
> I noted reference to a 40m vertical beam (vertical antenna with a  reflector).
> 
> http://www.chem.hawaii.edu/uham/index.html
> 
> I modeled  it on EZNEC and it appears to show good front-to-back ratio and 
> reasonable gain  (F/B 10 dB and gain 3.8 dB). I modeled it with the parasitic as 
> both a director  and reflector with about equal values for performance.
> 
> I was  wondering in practice if it would be doable to set the two verticals 
> the same  height and adjust one or the other (driven or parasitic) electrically 
> with a  coil/variable cap to adjust the height to take advantage of the set 
> up?  
> 
> Since the parasitic is grounded how critical are the radials?
> 
> Alan KB7MBI
> Woodinville, WA
>  
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