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looking at gain charts on Winegard site the 7698 doesn't show dbgain for channels 2,4 and 6....but the 8200 does. If you can explain why much appreciated.
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That's because the 8200 is a 2-69 antenna and the 7698 is a 7-69 antenna (it has no extra-long, 6-10', elements).
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Wondering why no comment to HD stacker antenna ot 8200u
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No one here that knows about antennas buys into Denny's sales pitch for the Stacker.
Based on the broadcast channels in use in your area, you don't need low-VHF channel reception. W04BS and W03AM are repeaters for WCCB with is easily receivable on VHF channel 10. The other VHF signal shown on channel 4 is too low of power to be receivable. That leaves you with a requirement for a long range antenna that provides coverage for channels 7-51 (or 69).
You can probably get a bit better performance out of separates rather than a 14' long antenna on your rotor. The most common combo is the 91Xg plus a 10-element high-VHF unit from Antennacraft or, if still available, Winegard. Add a decent two-input, medium gain pre-amp like the Antennacraft 10G221 or the RCA pre-amp and that's about as good as you're going to get.