I recommend putting the antenna on the roof. Having the antenna in the attic will lose 50% of signal. . Radio Shack has a well made Balun/Matching Transformer , Model 15-1140. . If the house has the flat composition type shingles most people use the tripod antenna mount. Also can use eave mount or chimney mount. . Also read and watch the video about the double rescan at
http://www.dtv.gov