While I can not speak directly of 4 sq interaction, I'll add my comments
on antenna interaction. I have an all vertical antenna farm if you will
with 17 verticals covering 160-HF.
In my case I have 3 elements interlaced with separate feed on 80m within
my 5 element 160m antenna which beams broadside end-fire in East/West
and Endfire NE,SE,SW and NW. I have not seen any degradation of either
array. You might picture it as being just like a vertical Yagi in
end-fire configuration.
I also have a full sized 8 circle on 40m with an old HighGain high tower
junior in the middle for HF Omni operation. In that case I do de-tune
via switched in inductance at the base of the Omni when not in use to
make sure there is very little if any coupling into the 8 circle array.
Again, I don't see any performance degradation.
If you have the space go for separation, if not there are simple
alternatives that have low impact on overall performance.
Bob, W7RH
--
W7RH DM35os
"It has become appallingly obvious that our technology has exceeded our
humanity." - Albert Einstein
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