A Winegard Hd7694P antenna directed at 92 degree magnetic compass will supply signal to 1 or 2 Tv's. If it will fit in the attic. Here is how to aim Tv antenna ,
http://www.kyes.com/antenna/pointing/pointing.html , Read and understand this about , Real Digital Broadcast Tv Channels , Virtual Digital Broadcast Tv Channels , Analog Tv Channels ,
http://forum.tvfool.com/showthread.php?t=695