I'd guess that the attic antenna isn't able to pick up VHF, which is where you'll find Ch 11. The ANT751 can tune VHF & UHF, so it picks up 11 for you. So what direction are you pointing them? Based on your plot, I'd have started at NE and see how it tunes from there. I will say that some of those channels are a stretch for the 751 at 60+ miles, but if you have a good clear view, it may work for you. You also potentially could use a UVSJ and put the 751 on the VHF side and the attic antenna on the UHF side.
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