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WAF is important! ;-)
So what direction does the 751 point to now? I assume you were able to tune NBC & CBS by turning the antenna towards a NW direction? You typically have to work to find the sweet spot for a single antenna. If your TV has a signal strength indicator, that can help you. Typically you want 70% or better.
As for why you aren't seeing NBC when it's close to ABC, the main difference is the broadcast frequency of Ch 8 vs Ch 6. On the chart, Ch 6 NBC is broadcast on UHF 44 (aka, Real 44). Ch 8 ABC is on VHF 8. Those signals are a a good ways apart on the scale. If you compare it to audio, it's kinda like a tweeter vs a woofer - you can hear the woofer from the kid driving past you well before you can hear his tweeter. So there has to be two different parts of your antenna that work to tune each of those. That doesn't help you fix it, but I hope it helps you understand it more.
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