http://forum.tvfool.com/showthread.php?t=4 The default antenna height is 10 feet , so put the antenna height at 25 feet. How many tv's will be connected? How many floors above ground does the house have? Is the house located in dense thick trees or not many trees close to the house? Is the house located down in a hole or on a hill? Is the house located on the side of the hill toward the transmitters or away from the transmitters?