The omnidirectional antenna that came with our trailer was useless in rural areas. I mounted a short pvc pipe near the front hitch to use as a flagpole mount. The pvc is permanently attached with u-bolts to the trailer frame. I bought this $30 motorized antenna from Walmart mounted it to the top of a flagpole and get more channels than I need. We went from no channels in Ludington State Park in Michigan to 40 channels (including several Wisconsin stations) depending on time of day. I still am able to fly Old Glory on the flagpole. It's my one modification I get a lot of positive comments on when camping.
The flagpole and antenna is stored for travel obviously, but only take a few minutes to set back up.
https://www.walmart.com/ip/Ematic-HD-TV-Motorized-Outdoor-Antenna-with-150-Mile-Range/46998188