Aim one antenna at about 315 degree magnetic compass direction and the oher antenna at about 185 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
The antennas Must Not be connected together on to one coax.
For 2 SEPARATE antenna systems use a Remote control A/B antenna switch ,
http://www.radioshack.com , #15-1968 , or ,
http://www.mcmelectronics.com , #32-4425.
A Remote control A/B antenna switch at each Tv location means that each antenna has it's own Separate coax system going to each Tv.
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 the antennas at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception.
It looks like the bottom antenna has a amplifier under it , if it is a amplifier what is the make and model number??
If it is not a amplifier then what is it??