I'm pretty sure that I take the prize for RV stupidity. When I bought my 'C' (new) I had an in motion satellite dish installed on the roof. It actually followed the Dish satellite signal as I was driving. Two problems. First, I'm single and don't (and can't) watch the TV while I'm driving. And when I parked for the night, there always seemed to be a pine tree directly between my dish and the satellite. Something about the sap blocking the signal.
Then I discovered that I really like FHU campgrounds that have cable. I'd remove the dome, except it would leave a 4" diameter hole in the roof, and its not in my way, so it stays where it is.