How to keep CB magnet mount from scratchin paint?

Have seen a lot of street rodders and corvette owners that just have a small tab coming out from under their rear bumpers and mount a fiberglass whip, then just a wrench and can remove it at a show. I have a Maxon hand held that would probably be more than adequate for caravaning, it did have a docking station that had a handheld mike and external antanea hook up but it is long since gone.