On 7/30/2013 7:46 PM, Jim in Waco wb5oxq wrote:
When choosing a height for a beam is 1/4 wave above ground at the lowest frequency
enough? 1/2 wave? I see Force 12 rating the gain on their beams at 74'1".
The best answers to your question are in the ARRL Antenna Book. It's a
real bargain, especially because it includes a CD with a starter version
of NEC, a nice program that computes loss in transmission lines, a Yagi
modeling program, and HFTA, which helps answer the question you just asked.
73, Jim K9YC
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