For anyone interested, I am now using both the outdoor antenna and the DIY attic antenna. I bought a UVSJ and inserted it before the preamp. I'm using the outdoor for VHF and the attic antenna for UHF. Signal strength is up for everything and it looks like this solution will work for now.
Thanks to those of you who offered help. I think the combination of a better antenna design and different location improved the reception for the problem channel.
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