I am not into 4 square vertical beams because of space problems but I have
seen various methods of insulating verticals, many unreliable and expensive.
But several years ago I shunt fed my one and only rohn 6 tower at my old QTH
with excellent results. This was about 99 foot high. Is there any reason you
could not shunt feed each vertical of your 4 square. Looks like it might be
cheaper and more reliable. Just curious. James in Ames W0NFL
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