I suggest a Winegard HD7698P antenna with a AP8275 preamp pointed at about 200 degrees magnetic compass. If you think the antenna will fit in the attic you can try it in the attic , however the best place is on the roof. Here are Strong and Sturdy roof mounts , tripod roof mount , chinmey mount , peak of the roof eave mount. Here is how point Tv antennas
http://www.kyes.com/antenna/pointing/pointing.html . The cable Tv wiring can be used with the antenna , DO NOT have the Tv antenna and 'active cable Tv' on the same coax at the same time. If the cable company has a line amplifier/distribution amplifier connected , it must be removed. Do Not have a amplifier and the AP8275 connected at the same time. Use a 4 way splitter with the antenna hookup. Here are places to buy Tv antennas and etc.,
http://www.3starinc.com ,
http://www.solidsignal.com ,
http://www.starkelectronic.com ,
http://www.amazon.com.