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Looking at the , Tvfool Radar plot and channel list for the Digital Current Plus Pending Applications Included.
Starting at the top of the list and going down the list.
For reception of the , LOS=Line Of Sight , Digital Broadcast Tv Stations/Channels in the Green and Yellow reception zones.
Down the channel list to and including WAFB-DT , Real VHF high band channel 9 , CBS.
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If you have the HBU22 now.
Then antenna aim is about 73 degree magnetic compass direction.
You can start with the attic location and see what happens.
And you can install the HBU22 Above The Roof in such a manner that the roof and building are not , obstructing , impeding , blocking , reception in the directions of , East , North East , North , North West , West , South.
Here are some above the roof antenna mounts.
http://www.ronard.com/909911.html.
Use the , ronard.com(911) , 5 foot tripod antenna mount.
http://www.ronard.com/34424560.html.
Use the , ronard(4560) , eave antenna mount.
http://www.ronard.com/ychim.html.
Measure around the chimney and use a , ronard(2212) , ronard(2218) , ronard(2224) .
Buy the ronard antenna mounts at ,
http://www.ronard.com , or ,
http://www.amazon.com.
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Home Depot has , 10 foot 6 inch lengths of , TOP RAIL , chain link fence , PIPE , that makes good antenna mast pipe. The price is about 10 dollars. That is a low price for antenna mast pipe.
The pipe can be cut to make it less long.
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If You Do Not Have The HBU22 Now.
Then use a HBU33 antenna.
I recommend install the HBU33 antenna above the roof and be done with it.
However it is your choice of antenna location.
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As Always , trees and tree leaves , plants and plant leaves , have Negative Effect on 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 Reception.
Multi-Path Reflecting Tv Signals Bouncing All Around.
The Best Practice for Reliable Reception is 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 including your own roof and building.