Ok in the attic of the 2 story house install a Winegard HD7696P antenna with a CPA-19 preamp aimed at about 170 degree magnetic compass direction.
Most attics have electric power outlet so install all of the preamp up there with the antenna.
Hang the antenna up high in the attic , try to keep it away from the metal in the attic.
The Tv/s Must Channel Scan for the Digital Broadcast Tv Channels sometimes named the 'Air Channels' or 'Antenna Channels' in the Tv setup menu because the Tv transmissions travel through the air from the transmitting antenna to the receiving antenna.
DO NOT channel scan for cable tv channels.
Here are some places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.amazon.com ,
http://www.winegarddirect.com