Your question is best answered by running an antenna model of your
proposed configuration. Perhaps one of the towertalkians has modelled the
C3 or C4 and can help you.
I hate to make guesses about antenna systems when analysis has been made
so simple and effective by W7EL, K6STI and many others who contributed so
much to the state of our art.
> I'm thinking of mounting a C3 (or C4) 10-15-20 (and 40) meter multi
> bander on a 50 foot tall tower below a 3 element 17 meter
> monobander. What is the MINIMAL separation that I should have
> between the beams so to minimize the interaction between them?
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