A simple reception situation. Signals are strong.
An attic installation will work Ok if.
There is no metal roof , no foil backed insulation , no thick roof tiles , no solar panels , no big thick trees in the direction of about 80 degree magnetic compass.
Install a ANT751 aimed at about 80 degree magnetic compass.
Also if the building is wood frame with wood or vinyl siding and no metal backed insulation in the walls.
A TERK HDTVi non amplified antenna aimed at about 80 degree magnetic compass will receive many channels.
Here is how to aim indoor antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
If the building has , concrete walls , concrete blocks , cinder blocks , bricks from ground to roof , big rocks for wall , metal siding , metal roof , metal backed insulation , solar panels , reception will be reduced or blocked.
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 the cable tv channels.