Welcome to the forums!
Sorry I can't be much help with your TV antenna antenna question, as I am unfamiliar with the antenna setup in newer trailers. Unless it's a matter of needing to turn on the amplifier, as others have suggested, it sounds to me like there must be a bad coax cable connection someplace, which can certainly happen and will probably be easy to fix. For what it's worth, the original TV antenna in our 1980 Caravelle works fine with our flat-panel digital TV.
Since you are in Wisconsin, I cordially invite you to join the Wally Byam Caravan Club, International (WBCCI). I especially
invite you to join as a member of the Wisconsin Unit, which in my humble opinion is the best unit in the WBCCI! (But, then, I'm slightly prejudiced!)
Please check out our website WBCCI Wisconsin Unit
, look at some recent editions of our newsletter, the Badger Bulletin
to see what we are all about. Feel free to send me a PM with any questions.
As luck would have it, the WBCCI International Rally is going to be June 28 - July 4 in Madison, just a few miles down the road from you. The International runs for a week and tends to be a little overwhelming to newcomers--I believe they have about 900 trailers signed up this year. If you would like to meet the Wisconsin Unit at a smaller, more laid-back Wisconsin Unit rally, the next one will be the weekend August 14 - 17 in Pipe, Wisconsin on Lake Winnebago.
Again, welcome to the forum, and hope to meet you soon!
See you down the road,