Got it , very good thank you. I recommend a Winegard Hd7694P antenna with No amplifier , aimed at 42 degree magnetic compass. Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html Roof mounted , here are some antenna mounts ,
http://www.ronard.com/909911.html ,
http://www.ronard.com/34424560.html ,
http://www.ronard.com/ychim.html . Here are places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.starkelectronic.com ,
http://www.amazon.com . Use new RG-6U coax to do the outside wiring.