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I have No Words and No Advice that will make a Tv antenna work in a attic , no matter what.
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Install a ,
http://www.antennacraft.net , HD1800 all channel antenna aimed at about 94 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Use a Real and Actual magnetic compass to aim antenna.
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Install the HD1800 all channel antenna Above the Peak of the Roof in such a manner that the roof and building are not , obstructing , impeding , blocking , reception in the directions of , East South East and North West.
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Here are some above the roof antenna mounts.
http://www.ronard.com/909911.html.
Use the , ronard(911) , 5 foot tripod antenna mount.
http://www.ronard.com/34424560.html.
Install a , ronard(4560) , eave antenna mount.
http://www.ronard.com/ychim.html.
Measure around the chimney and use a , ronard(2212) , ronard(2218) , ronard(2224) .
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Install a , RCA TVPRAMP1R preamp.
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For 1 Tv connected use No splitter.
For 2 Tv's connected use a , Holland Electronics , HFS-2D , 2 way splitter.
For 3 Tv's connected use a , Holland Electronics , HFS-3D , 3 way splitter.
For 4 Tv's connected use a , Holland Electronics , HFS-4D , 4 way splitter.
Buy the , HFS-2D , HFS-3D , HFS-4D , splitters at ,
http://www.solidsignal.com , or ,
http://www.hollandelectronics.com.
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As always , trees and tree leaves , plants and plant leaves , have a Negative Effect on , OTA=Over the Air , Broadcast Tv Reception and so do buildings and other obstructions including your own roof and building.
Some and not all Negative Effects are.
Absorbing and Blocking , Tv Reception.
Multi-Path Reflecting Tv Signals Bouncing All Around.
The Best Practice is to install the HD1800 antenna at a location trhat has the least amount to no amount of obstructions of any type or kind in the directions of reception including your own roof and building.
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The Tv's Must Channel Scan for the , OTA=Over The Air , ATSC - Digital Broadcast Tv Stations/Channels , often named the ~ DTV Channels ~ Antenna Channels ~ Air Channels ~ in the Tv Setup Menu Because the Tv transmissions travel through the Air from the transmitting antenna to the receiving antenna.
Some digital tv's will Automatic channel scan for cable tv channels.
DO NOT channel scan for cable tv channels.
Go into the Tv Setup Menu and select ~ DTV Channels ~ Antenna Channels ~ Air Channels ~.
Channel scan for the , ATSC - Digital Broadcast Tv Stations/Channels.