I am also interested in this. When we first got our trailer, I wondered why this is even there. Then after getting the antenna work by making a little shunt that goes on the exterior cable connection, I was able to get 4 channels so I could now watch Maury in the middle of the day
We then changed out the LG TV for a Samsung curved monitor and don't have a TV tuner anymore.
So taking this thing off the roof would be fine with me as well.
I would suggest pulling the interior jack cover and disabling the 12V
switch as well so you don't have any electrical shorts down the road. If you chase the 12V
connection to the bus bar, you could pull the connection to make sure it has been disabled.
As far as sealing up the holes. I would use a Sikaflex product and maybe even a patch made out of aluminum sheet cut to fit. Then attach it using the existing screw holes.