Jim M0BMU,
Thanks for the further information on the planned tests. With the
spacing between big and small masts that you are intending to use, and
with the "big" mast being much shorter than needed for natural
resonance, I believe you will have tolerable mutual coupling effects.
Resonating the big mast would maximise any on-site coupling when
transmitting from the small antenna, and is probably worth testing out
to assess interaction. Having the big mast "floating" likely gives
least interaction, but again doing a practical test would yield results
that narrow down the uncertainties and improve understandings of the
punters regarding big/small comparisons.
All the best for the day at Puckeridge.
73, Bob ZL2CA
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