To receive the groups of Digital Tv stations/channels to the north north east and south west with 1 antenna install a Antennas Direct Clear Stream 2 Complete ,
http://www.antennasdirect.com/store/...VHF-Combo.html , aimed at about 200 degree magnetic compass.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Remove the reflector Screen and the CS2 Complete will receive the Tv stations/channels at the front of the antenna and the back of the antenna , to the north north east and south west.
Also install a Antennas Direct CPA-19 preamplifier.
Here are above the roof 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.
Here are places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.antennadirect.com ,
http://www.amazon.com