For reliable reception with one tv antenna , of the tv stations channels to the north west , Install a Winegard HD7698P antenna with a Antennas Direct CPA-19 preamp aimed at about 325 degrees magnetic compass. Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html. The HD7698P antenna will be mounted about 25 to 30 feet above the ground. Mounting a antenna above the roof of a one story house will get the antenna about 25 feet or so above ground. Here are some above roof antenna mounts ,
http://www.ronard.com/909911.html ,
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http://www.ronard.com/ychim.html ,
http://www.ronard.com