[JRTJH]

You probably have something like this located behind your main TV.

It is a satellite/cable connection plate.

The way it is "supposed to work" is you connect the satellite receiver or the cable input to the rear outside connector on your RV, Then go inside, remove the jumper between the two coax connectors, install a coax from the lower connector to your cable decoder box or satellite receiver IN on the back of the receiver. Then connect the receiver OUT to the top connector on the plate. TURN OFF the Winegard booster switch and you "should" have satellite or cable input through the system to the main TV. Whether there are splitters in the system to feed other televisions in the RV is an individual RV question.

Here's the satellite connection plate as it came from your dealer. If you connect to cable and don't need a "cable decoder box" then leave the jumper in place.