As always , trees and tree leaves do a real fine job of reducing or blocking Tv reception and so do buildings and other obstructions.
It is best to install a antenna at a location that has the least amount to no amount of any type or kind obstructions in the directions of reception.
A gap in the trees.
When the trees are close , I have put the antenna on the other side of the trees when there are little to no trees beyond.
And can even mount a antenna in a tree , straight pine trees are good antenna towers.
http://www.ronard.com ,
http://www.ronard.com/tree_adjust.html.
Cut branches away in such a manner that no branches can whip around and destroy the antenna.