Originally Posted by timmaah
Grounding plate for a now gone antenna?
I don't think so - the batwing antenna is there, and that's the only antenna up there. Radio antenna is at the traditional location: on the side near front corner. I don't know what they would have removed. Ours is too old to have things like satellite radio stock (I just added it), for example. It may be some sort of ground plate for the TV antenna, but it's odd that the antenna doesn't even touch that plate.
I'm hoping to climb up there this weekend to install something, so I'll take a closer look at ours and verify (a) we have one, and (b) see if I can figure out what it is.