In the attic aim the antenna at about 195 degree magnetic compass. Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
From the antenna run a coax to where the other coaxes go out to Tv locations.
Install a Channel Master 3418 distribution amplifier.
http://www.channelmasterstore.com.
Channel Master has converter boxes.
http://www.walmart.com , has these converter boxes. RCA DTA800B1 , Sunkey ATB150S , Magnavox TB110MW9.
http://www.epvision.com has converter boxes.