If this were my receiving situation I would give a Winegard MS2002 a try in the attic. The MS2002 might need to be turned for the best reception of the Tv stations at the directions of magnetic compass 140 and 251 PBS and then clamped in place. If the MS2002 does not receive all the high strength stations in Green at about 25 feet height in the attic then the MS2002 can be moved outside for better reception. I recommend a eave mount , Channel Master CM 9030 ,
http://www.sadoun.com/Sat/Products/Perfect/PVEM1.gif , or chimney mount ,
http://www.eham.net/libraries/download/430/Photo_A.jpg , Channel Master CM9067 . Here are places to buy Tv antennas and etc. ,
http://www.solidsignal.com ,
http://www.starkelectronic.com ,
http://www.amazon.com ,
http://www.3starinc.com