I'm thinking about a 4" x 12" copper wall plate on each side of the antenna pass-through between the shop where the PVC surfaces from the outside and the adjacent shack. The plate would be 1/8" thick and held in place with stainless steel screws and 4-6" bulkhead SO-239 amphenol connectors. I don't anticipate having more than 4 active antennas at one time. The ground strap feeding in from the outside would also be attached to the copper plate. The polyphasers at the entrance would also be grounded as well as the baluns.
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