Thanks for the link. This is great stuff. It makes me nostalgic for my days in the engineering lab, which is the last time I used a spectrum analyzer.
I had heard about the differences in NTSC vs. ATSC signals and why a flat response is important for digital. It has become pretty obvious all of a sudden. It is appears doubtful that a CM4228 will be enough for High-VHF, so I probably would need separates at some point.
It looks like you are on the North side of the 95 and at a higher elevation. I compared TV Fool plots between your (estimated) location and mine. The RI stations are about 10dBm lower for my location from what I can tell.
I have attached the TV Fool plot if it helps, along with a couple pictures of the analog reception I received with the rabbit ear/loop combo in July (10 and 12 from Providence).
As respects the notch filter, do you only need it for 17? I am worried about 34, 26 & 69 as well. It seems that any one of them could overload a CM7777.