I am going to install the polyphasers and antenna switch this weekend. The entrance panel I have has an aluminum plate in it (1/8" thick). I prefer copper. I have some copper grounding plate left over from an old project. It is 1/16" thick. Option A: Just use the copper plate. The only thing about that is that it is not very thick and may bend or move with all the polyphasers and cables on it. Option B: Cut a piece of the copper and put it over the aluminum plate. I have enough for front and back. I was going to spread Noalox in between if I do that. This would give me a good copper grounding plate and very durable.