If the house is wood frame with wood or vinyl siding , then a NON AMPLIFIED indoor antenna such as the Channel Master CM4010 or Terk HDTVi indoor antenna aimed at about 104 degree magnetic compass. Pull the rods of the indoor antenna all the way out and have the rods of the antenna in a low V <- lower then this V. Do not have the rods of the indoor antenna straight up like this , ||. If the house is , concrete , concrete blocks , cinder blocks , brick from ground to roof , big rocks for walls , stucko and stucko Wire , metal roof , metal foil backed insulation , solar panels , the antenna is put in the basement , then reception will be reduced using a indoor. For your reception situation. A better outside Roof Top antenna is the RCA ANT751 antenna or a Antenna Craft HBU22 antenna. Here are some places to buy antennas and etc. ,
http://www.channelmasterstore.com ,
http://www.antennacraft.net ,
http://www.amazon.com ,
http://www.ramelectronics.com ,
http://www.tigerdirect.com ,
http://www.solidsignal.com . Here are some roof top 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 mounts from solidsignal by typing the word ronard in the solidsignal search box or buy from ronard.