My choice is the ANT751 aimed at about 135 degree magnetic compass.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
The techshield metal backed insulation can reduce or block Tv reception so the antenna is mounted above the roof.
Here are some 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 by typing the word ronard in the ,
http://www.solidsignal.com , search box or buy from ronard.