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A rough guess-ti-mate of the UHF gain would be between a few dB positive and as much as 10 dB negative. Expect the net gain to vary across the UHF band also. The positive NM figures shown in your TVFool report suggest that an antenna with negative net gain could successfully receive several signals, which seems consistent with the experience you're reporting.
The beam-width of the HD7698P is (over the majority of its bandwidth) about 40° (+ and - 20° from center). Aiming west or NW is consistent with your TVFR. Suggested aim point is just that, a suggestion and/or a starting point from which to fine tune the final aim.
I would expect you to see significantly better signal quality if you opted to replace your old antenna with the suggested Winegard. The AP8700 amplifier is also a good option, the Antennas Direct PA-18 is another very good choice, it's noise figure is a bit better.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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