I suspect attic enhanced multipath.(signal reflections) Getting the antenna out of the attic would be my first move. If the antenna must remain in the attic, I would first try relocating it & adding an FM trap. If this doesn't help, I would then replace the current antenna with a more directional antenna such as an HBU-33.
Signal overload is highly unlikely at 6 miles with any antenna unless it is amplified. OTOH multipath is many times more problematic as you get closer to the transmitter. A higher gain/directional antenna mounted outside is the best defense against multipath from my experience.
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