If you have trees in the way, get a chainsaw while you're at it... Personally, I like the Stihl MS290
Seriously, trees have the capability of effectively shredding the signal before the signals ever arrive at the antenna. Just like Humpty Dumpty, all the king's horses and all the king's men and the right antenna and the most capable ATSC tuners around can't put it back together again.
It's important to select a mounting location that minimizes the potential ill effects of trees. It will greatly improve your odds of success.