Thanks for making the test and giving us the report.
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Started backing the knob down a litltle at a time and saw no change.
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If you were using the AD ATT-1 attenuator, you should have seen channels getting worse as you turned it down. It can turn down about 3-3/4 turns.
You didn't answer this question:
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Were you using the attic antenna before the new roof? If you were, was there any change in reception after the new roof?
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What equipment are you using for reception? How many TVs do you have?
Have you tried another TV with the antenna?
Have you tried a double rescan to clear the tuner memory?
https://www.google.com/#q=FCC+double+rescan
When all of those are checked, then it is time to try a preamp.