Install a Winegard HD7084 antenna aimed at about 252 degree magnetic compass. Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html . Replace all outside coax with new RG-6 coax , and any inside coax that looks like it might be bad , replace it with new RG-6. Here are places to buy antennas and etc. ,
http://www.winegarddirect.com ,
http://www.solidsignal.com ,
http://www.amazon.com. Here are antenna mounts ,
http://www.ronard.com/909911.html ,
http://www.ronard.com/34424560.html ,
http://www.ronard.com/ychim.html