Is your antenna a smaller "batwing" ( Jack Brand)? If so, the one on our motorhome does not have as good as reception as the crankup type we have had on other RV's. With that being said, have you set your TV up ( in the menu) to receive from an antenna, not cable? Also, did you do an "automatic channel search" to find and lock in those channels available?
If either of those actions were not done, that could be your issue.
Days camping (2015)----88 days
Days camping (2016) ---110 days
2016 Wildcat MAXX 28RKX (33' TT), 2007 13' Scamp
2015 Ram Laramie Hemi
30 years RV'ing
12 different RV's