I recommend one of these simple Non Amplified indoor antennas.
http://forum.tvfool.com/showthread.php?t=233 aimed at about 200 degree magnetic compass. Here is how to aim indoor antennas ,
http://www.kyes.com/antenna/pointing/pointing.html. I Do Not recommend using a amplifier of any type or kind , the tv transmissions are very strong at the receive location , a amplifier will likely make the reception worse by amplifing reflected signals created by the building.