We resolved the problem with the cable connection. The existing setup is focused on the satellite receiver. To overcome the problem, we ran a cable from the cable / antenna outlet (located in the upper front cabinet above the passenger seat) directly to the back of the television mounted at the front of the coach (above the front driver and passenger captain's chairs). As the television only has one cable input, this necessitated unscrewing the cable for the satellite. As I don't want to use the satellite, that worked for us. If one wanted both for some reason, a splitter may fix that problem.
Anyway, we have run across other Forest River motorhome owners with the same complaint so wanted to post the fix.
Don't forget that you have to go to the "setup" box on the television to direct the television to a cable or antenna setting and then search for channels. The channel search needs to be done at each new location.