Ok I recommend a Channel Master CM3016 antenna , no preamp needed , mounted on a CM9521A rotor. The largest group of Network stations all in one place is at about 311 degree magnetic compass. The other large group of Network stations is at about 85 and 101 degree magnetic compass. Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html , Here are places to buy antennas and etc. ,
http://forum.tvfool.com/solidsignal.com ,
http://www.amazon.com ,
http://www.starkelectronic.com ,
http://www.3starinc.com ,
http://www.channelmasterstore.com