could be that the antenna is not even hooked up inside the ceiling somewhere. Or the tv is not set in the correct setting . If you have an antenna on the roof of your house , take the tv over to your home and try with house antenna to see if the tv is ok. Might as well eliminate that before you start to take antenna off trailer roof....sound like it is probably a Jensen antenna.
It was a rainy few days at Algonquin Prov park...tarps kept us dry.
Wayne --Belle River (Windsor), Ontario
2013 Sunset Trail Reserve 25RB..
2015 White Chev Silverado 2500HD 4x4 (6.0 l gasser)
2003 Mountain Star 890SBRX Truck Camper