I am assuming that you are attaching to the connector that is for the campground cable TV hookup!!! In which case do the following - At the booster the cable that comes off the front, labelled TV on the booster, which goes to the TV supposedly, remove it and attach to the out of the receiver now run a cable from the booster, the connector that had the cable you took off, to the in of the receiver. assuming the cables are all of the proper type and the cable that is supposed to go to the TV is actually attached to the TV it should work.
If you are hooking to the connector that is for an outdoor TV then you have a different setup to do.
New 2016/17 Sunseeker 3010ds. GVWR 14,500lbs, GCWR 22,000lbs, hitch rated 7,500lbs. Usually loaded to 14,300lbs maxing rear axle.