[JRTJH]

I'd have to first ask: What changed from last year???

Is this the same trailer, antenna and TV? If so, then there's a "system breakdown" somewhere. Antenna connectors corroded? Booster on the blink? TV electronics failure? Coax connector problems somewhere inside a wall?

If this is a new trailer, then it could also be "sub-standard equipment" or any of the above. I'd first take the TV out of the trailer and try it at home with a "known good signal". If it works, then start "back tracking" until you find the problem. There are a number of "less than the best" antennas that are bring installed on new RV's (from every trailer manufacturer). It could be the antenna quality or ????

If the trailer is new and you want the hassle of "wait and hope" from the dealership, take it in for service. It'll probably be faster and less frustrating to just do some "self service"...... Plus, if it is the antenna quality, the dealer won't replace it with a better antenna unless you "pay for the upgrade" so might as well save the expense, unless you just like donating to the dealer's wellbeing.