You should model your system on EZNEC. It is surprising
how much interaction there is even at 100-200 ft spacing.
Unless you have lots of land, you will want to detune
the 80 meter antennas when you are on 40. What I do with
mine is break up the 80 meter antenna with an insulator
at the 30 ft level and use a relay to short out the insulator
only when on 80. This makes the 80m vertical completely
invisible on 40.
Steve Sala wrote:
> I am planning both a 40-meter and 80-meter four square next year in my back
> field. I am mowing the field this month to stake out the potential area. I
> do not want to put the 40 meter inside the 80 meter area, but put them side
> by side, both on a line East to West so the 4 corners are 45 degrees, 135
> degrees, 225 degrees, and 315 degrees for best overall to Europe and Japan
> from Eastern WA. What is the spacing I should make between the edges of each
> array for no interaction. Any information would be appreciated.
> Steve Sala
> Nine Mile Falls, WA
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