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I think most of them now are their fiberglass, which if I remember right, doesn't conduct the magnets. Okay, Richard. Well, that's an interesting question, and there's lots of different solutions for it. But I hope that antennas are on my roof, other than VHF, UHF antennas, and they usually are manufactured, etc., where they don't need a ground plane, so they don't present that problem. But for those that do, even though the ones that do have to have a ground plane, if it's a VHF, UHF, and some people will put a metal plate on a roof to mount it on, preferably something that isn't going to rust.