Ok , Research and Evaluation shows Not all of the information provide by tvfool is accurate.
After obtaining accurate information here is my recommendation.
This is a 2 antenna installation , mount a Antenna Craft CS600 above the roof aimed at about 190 degree magnetic compass.
And also mount a Antennas Direct DB4e antenna above the roof aimed at about 228 degree magnetic compass on the same mast as the CS600 and have the CS600 below and the DB4e above the CS600 separated by about a foot or so on the same mast.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html .
Combine the 2 antennas with a UVSJ = UHF/VHF Separator/Joiner.
And a Antennas Direct CPA-19 preamp connected to the output of the UVSJ.
Antennas Direct has a UVSJ (also known as UHF/VHF Antenna Combiner) in a weather resistant housing that is mounted to the mast.
Here are some 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 solidsignal search box or buy from ronard.
Here are places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.amazon.com ,
http://www.antennacraft.net ,
http://www.antennasdirect.com