For reception of more Tv stations and channels install a Winegard HD7084P All channel antenna with a Winegard AP8700 preamp above the roof aimed at about 230 degree magnetic compass.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
This is a Separate antenna and antenna system from the 91XG that is aimed north/east at bout 34 degree magnetic compass.
The 2 antenna systems Will Not be connected togeather on to one coax.
The 2 Separate antenna systems coaxes will go to the location of the Tv and will be connected to a remote control A/B antenna switch.
http://www.radioshack.com , # 15-1968 or
http://www.mcmelectronics.com , # 32-4425.