When we use to cover our TT (we don't any more), I'd take the antenna off. Remove the set screw and it comes clear off. I noticed there is a sharp edge on the part where the set screw is, so the antenna could swing different directions. I simply placed a plastic bowl over the top of the whole thing then, then put the cover over it. It held in place until Spring and then put the antenna back on. Did that for several years.
