In my modelling exercises with 4 squares I have found that almost anything
near a 4 square will upset it and it doesn't have to be even near resonance.
>From memory, anything from about 0.3 of the height. Other masts and towers
have a bad effect on f/b but not much on gain as such. This works out in
practice, too. At my contest site (G6M, G6MC, I'm not there anymore) I got
poor directivity in one direction with other towers when on the 80m 4square.
I developed a passive array which is not affected and I am hopeful can be
arranged as nested set for several bands. It's all theory at this stage but
I'll try it on higher bands first where I have the land to try it.
David
G3UNA
> Can an 80M 4 square be placed inside a 160M version without serious
> degradation?
> Both will use the pretty standard 1/4 wave spacing system of firing down
> the long base line.
>
> Havent been able to get a definitive answer elsewhere.
>
> Carl
> KM1H
>
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