I have two ports on the outside of my 2010 Flagstaff for that reason.
One is for cable and it goes to the middle F connector on the amp and the other is for Sat and it goes right to a wall plate F connector marked Sat above the selector button.
Note with a bit of a wiring re-route I can port the TV signal to the outside for a porch table TV using the Sat wire. A short loop of coax cable between the two F connectors on the plate. The downside is the outisde F connectors are on the rear of the camper next to the power cord. Need a LONG coax to get to the porch area; but no routing through the slide seal.