I'm planning on using some insulating material under BPC25 and BPC55 Rohn
base plates (and around the pier pin in the center) so the towers may be
series-fed on 160.
Is 7/16-inch thick enough for this purpose?
I think you would end up with a pretty good capacitor from tower base to
ground. Plus, what if a lightning surge breaks down the thin sheet of
insulating material?
I would opt for a real base insulator. If you can't find a used one removed
from a broadcast tower, you could fabricate one from a large electric power
insulator. I have seen ones about 6" in diameter and anywhere from 6" to
over 12" tall, with metal castings with tapped screw holes at each end.
-k4kyv
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