I recommend a Winegard HD7697P. The HD7697P will provide more signal strength so as to connect more the 1 Tv. Mount the antenna a minimum 4 feet above the metal roof. Here are some strong and sturdy antenna mounts , tripod mount , chimney mount , peak of the roof eave mount. The metal roof will block Tv transmissions so the antenna cannot be in the attic and the metal roof must not block the Tv reception to the south east. Read and understand this about Real Digital Tv Channels , Virtual Digital Tv Channels , Analog Tv Channels ,
http://forum.tvfool.com/showthread.php?t=695 , Here is how to point Tv antennas ,
http://www.kyes.com/antenna/pointing/pointing.html . . Here are places to buy Tv antennas and etc. .
http://www.3starinc.com ,
http://www.solidsignal.com ,
http://www.starkelectronic.com . . Here are some online Tv Guides ,
http://www.titantv.com ,
http://www.television.aol.com ,
http://www.tvlistings.zap2it.com