My 2014 Itasca 30T has the same problem. I have connectors marked Satellite In and Cable In in the outside bay. The wiring diagram shows three different splitters, but no indication of where they may be located. I'm certain one of the splitters is either a cable model instead of a satellite, or is defective. Winnebago apparently believes their products are never to fail and hide all the serviceable connections somewhere behind panels. I'm not willing to tear walls apart looking, so run cables from my portable through windows to each TV.