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It's interference, either multipath or electronic or electrical noise.
The single most effective thing you can do is get the antenna out of the attic and test outside to see if the reception improves.
Could easily be interference from nearby FM radio stations. If you still have any Radio Shack stores or dealers nearby, see if they have an FM Trap (filter) on hand. Catalog number 15-0024 (or 1500024). Call them personally, do not rely on their website.
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