To all who responded, "Thanks". I found the problem. Finally, I removed all the connections to the Winegard video controller. Then I eliminated all cables that did not have the capacity to carry a signal baed on their origin. Then I tried all cables, regardless of how they were tagged , and found that the cable marked "Satellite" was in fact the "Antenna" cable. When I plugged "Satellite" into "from TV Antenna", I immediately received 21 channels !. Why, or by whom the cables were mislabeled is a mystery. When I removed the digital converter, I should have noticed that the cables being removed were mislabeled. But, I did not. Anyway, mystery solved and another takes it place. Why the wrong labels, either from the factory or from some video add on shop used by the coach's first owner. Thanks again.