[TowerTalk] add a 3rd el to 40-2cd

[Jim Brown]

On 3/6/2018 1:57 PM, john at kk9a.com wrote:
> I have OptiBeam 40m antennas and when playing with a model, adding an
> element really did very little. I do not recall the details but I think
> some things like SWR bandwidth were even worse. You are probably better
> off using the aluminum to make a Moxon

I agree. In general, for an optimized design, gain in a Yagi is largely 
related to boom length. To benefit from a third element, it would 
probably be necessary to lengthen the boom. AND -- I wouldn't expect 
more than a dB or so for a build-able (and stay-up-able) antenna. :)

73, Jim K9YC