Aim a ANT751 antenna at about 140 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
As always , trees and tree leaves , plants and plant leaves , have a Negative effect on broadcast tv reception and so do buildings and other obstructions in cluding your own roof and house.
The Best Practice is to install the antenna at a location that has the least amount to no amount of obstructions in the directions of reception including your own roof and house.