Install the ANT751 antenna above the roof in such a manner that the roof or house is not blocking reception to the , north east , east , south east.
Aim the ANT751 antenna at about 65 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
As always , trees and tree leaves do a real fine job of , reflecting , reducing , blocking , Tv reception and so do buildings and other obstructions including your own house.
It is best to install a antenna at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception including your own house.