The Tv transmissions are moderate to strong of signal strength. A simple reception situation. If the building is wood frame with wood or vinyl siding and standard composition shingles , then install a Winegard HD7696P antenna in the attic aimed at about 160 degree magnetic compass. Here is how to aim antennas ,
http://WWW.kyes.com/antenna/pointing/pointing.html. If there is room to move around in the attic. The antenna can hang in the attic from thick strong string or cord. Or hang a pipe from the rafters. Here are some places to buy antennas and etc. ,
http://www.winegarddirect.com ,
http://www.solidsignal.com ,
http://www.amazon.com