Read and understand about , REAL Digital Broadcast Tv Channels , Virtual Digital Broadcast Tv Channels , Analog Broadcast Tv Channels ,
http://forum.tvfool.com/showthread.php?t=695 , example - WUNC-TV , the real channel is UHF 25 , the virtual channel is 4.1. For antenna aiming I suggest aim the antenna at about 130 degree magnetic compass. This should get the tv stations in the magnetic compass directions of , 306 , 181 , 125 , 71. I also recommend have one tv connected as a test , No amplifiers or amplifier power supplies of any type or kind. None. Coax is connected from the antenna to the tv.