Install the ANT751 above the roof in such a manner that the roof or house does not block reception to the west north and east north.
Aim the ANT751 antenna at about 280 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
The ANT751 antenna is a small antenna and as such is not a very directional antenna , the ANT751 does have some forward gain , and also receives good to the front angles and back and back angles.
The least amount of reception of a directional antenna is directly on the sides.
With the ANT751 aimed at about 280 degree magnetic compass direction it will better receive the weaker Tv stations to the west north and still receive the stronger Tv stations to the east north.
Install a Channel Master CM3418 distribution amplifier.
I recommend run all Tv's off the distribution amplifier.
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As always , trees and tree leaves do a real fine job of reducing or blocking Tv reception and so do buildings and other obstructions including your own house.
It is best to install the ANT751 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.
The Tv's Must Channel Scan for the Digital Broadcast Tv Channels , sometimes named the 'Air Channel' or 'Antenna Channels' in the Tv setup menu because the Tv transmissions travel through the air from the transmitting antenna to the receiving antenna.
DO NOT channel scan for cable tv channels.
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Here are some places to buy equipment ,
http://www.solidsignal.com ,
http://www.amazon.com ,
http://www.channelmasterstore.com.