Attaching a satellite to the top of a TT

On my trailer there is an outside connection labeled Satellite and another right next to it labeled Cable. I've tried connecting the satellite cable to both and it doesn't work on either one. Don't know if there is a splitter or not, just know that it doesn't work. On the inside of the trailer there is a connection for the antenna that's on the roof, that works, as I used it prior to getting the satellite. There is another connection on the wall, it's not marked. I assume it's for either satellite or cable.

I'll have to check on getting the kit to put in the wall. Would be so much easier than running the cable through the entry door.