Additional comments:
All of your stations are UHF, so there is zero need for any of the antennas with wide elements such as the 5020, Stacker, or even the 751. Only the 91XG is a "best" fit your stations of interest.
The ANT751 worked somewhat better for a reason that's not immediately obvious - it's because its a lower gain antenna that didn't increase the signal strength of the PBS station as much as the other antennas that all feature higher UHF gain.
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