Well Ok , no interest in the Tv stations/channels to the North.
For better reception of the Tv stations/channels to the south with less interference from the Tv stations/channels to the north.
Install a HD76987P antenna or a HD7698P antenna with a starting aim at about 180 degree magnetic compass.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Installing the antenna higher will mean less signal reduction and interference from tress or buildings to the south.
Here is the Federal Antenna Law that says Yes you can install and use and maintain a antenna above the roof.
http://www.fcc.gov/mb/facts/otard.html.
Here are some 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 soildsignal search box.
http://www.solidsignal.com.
You can try the HD7697P or HD7698P antenna at 11 feet above ground.
The HD7697P or HD7698P antennas can be turned to the south/west and south/east to find a antenna aim position that produces the best reception of the Tv stations/channels to the , south/west , south , south/east.
Here are places to buy antennas and ect. ,
http://www.solidsignal.com ,
http://www.winegarddirect.com ,
http://www.amazon.com.