Hi tlcarter65,
Welcome to the Heartland Owners Forum.
Typically, the rooftop TV antenna and the cable TV coax come together at the signal booster. It must be ON for over the air TV and OFF for cable. For trailers with 2 or more TV locations, the booster is usually in the bedroom. But on some rigs it's at the living room TV location.
As for radio reception, it's likely that there's a dipole type antenna behind the radio. If it's tied in to the signal booster, that would probably be by way of a splitter at the coax wall plate near the radio.