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I live 5-1/2 miles east of those transmitters, which are all clumped on Pinnacle Hill at I-490 and Monroe Ave. I would think that if you get all the other stations except 8.x, it would have to be multipath, as Teleview suggested. In fact, 8.x was always one of, if not THE, strongest stations at my house. Now that I have an outdoor antenna (in the attic), they're all 100%, including 10 and 13 (h-vhf), which were always a little problematic with an indoor antenna. Since you can't read higher than 100%, I can no longer see any signal strength/quality difference between stations, so I don't know their relative strengths at the antenna any longer.
All I could suggest is that you move the 751 around until you get a clean signal from all stations. Perhaps clamp it to a tall ladder and move it around along the wall. Probably best to try a location above the roof, though. According to the gurus here, sometimes even inches can make a big difference, especially with UHF. Could be that the reflection from your neighbor's house (or somewhere else) is cancelling or confusing the direct signal enough to make 8.x un-receivable.
Any chance there's a reflective surface behind the siding that the antenna is mounted on? My neighbor's house has a layer of something like that under the siding, which messed with his reception (attic mounted) until he moved the antenna so it was looking through the roof instead.
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