A Simple reception situation.
As to installing a antenna in the attic , I will leave that for some one else to answer.
For reception of the Current Plus Pending Applications Included Digital Tv stations/channels in the Green and Yellow reception zones of the tvfool channel list , down to and including KWPX-TV Digital UHF channel 33 , ION Television.
I recommend install a Winegard HD7694P antenna Above The Roof aimed at about 155 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
A coax from the antenna will go to the place where the 4 other coaxes go out to the Tv's , install a Channel Master CM 3414 , 4 way distribution amplifier.
Here are some above the roof antenna mounts ,
http://www.ronard.com/909911.html ,
http://www.ronard.com/34424560.html ,
http://www.ronard.com/ychim.html ,
http://www.ronard.com.
Buy the ronard antenna mounts at solidsignal by typing the word ronard in the solidsignal search box.
Here are some places to buy antennas and ect. ,
http://www.solidsignal.com ,
http://www.amazon.com ,
http://www.winegarddirect.com ,
http://www.channelmasterstore.com.
As always , trees and tree leaves do a real fine job of reducing or blocking Tv reception and so do buildings and other obstructions.
It is best to install the antenna at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception.
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.