As always , Attics Are Not a reception friendly environment and Never Will be a reception friendly environment.
For Improved Reliable Reception move the antenna to Above The Roof.
No antenna amplifier.
Install the antenna above the roof in such a manner that roof or house is not blocking reception to the , south west , south , south east , north west , north , north east.
Here is the Federal Antenna Law that says Yes You Can , install , use , maintain , antennas above the roof ,
http://www.fcc.gov/mb/facts/otard.html.
Aim the antenna at about 190 degree magnetic compass direction , an in between aim direction of the Tv stations to the , south west , south , south east.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
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.
As always , trees and tree leaves do a real fine job of reducing or blocking Tv reception and so do buildings and other obstructions including your own house.
It is best to install the antenna at a location that has the least amount to no amount of obstructions including your own house in the directions of reception.
The Tv/s Must Channel Scan for the 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.