Above the roof Install a Winegard HD7084P antenna with a Winegard AP8700 preamp aimed at about 335 degree magnetic compass reading.
Above the roof install a Winegard HD7696P antenna with a Winegard AP8700 preamp aimed at about 150 degree magnetic compass.
If both antennas are on the same mast , put the HD7084P on the bottom and the HD7696P antenna on top , separate by about 3 feet.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
If required , here are Strong and Sturdy antenna mounts ,
http://www.ronard.com/909911.html ,
http://www.ronard.com/34424560.html ,
http://www.ronard.com/ychim.html ,
http://www.ronard.com.
Buy the ronard antenna mounts at solidsignal by typing the word ronard in the soldsignal search box.
Here are some places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.amazon.com ,
http://www.winegarddirect.com.
The 2 Tv antenna systems Will Not be connected to gather on to one coax.
The 2 Separate antenna systems Will Be separate all the way to the location of the Tv.
The 2 separate antenna systems coaxes will be connected to a A/B antenna switch ,
http://www.radioshack.com , #15-1968 , or ,
http://www.mcmelectronics.com , #32-4425 .
A/B antenna switching is channel surfing friendly , push the button on the hand held remote control , changes antennas and keep on channel surfing.
If more then 1 Tv is connected use ,
http://www.hollandelectronics.com , also available at ,
http://www.solidsignal.com , HFS-2D , HFS-3D , splitters
The other way to do it is put the HD7084P antenna on a rotor.
Antenna rotors are not channel surfing friendly , must wait for antenna to rotate.