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They don't show gain figures, but the ad copy touts its ability to receive off the back and the front (presumably equally), thereby increasing the number of channels potentially available. The problem with that is that it's bidirectional, like a naked UHF loop or bowtie without reflector, while the Wingman kit increases the gain in the direction it's pointed, and presumably reduces it off the back (you can't get something for nothing in physics). Absent any other info, I'd have to guess the Wingman kit on the Sensar would bring UHF signals in a bit stronger. No saying how much, since they don't publish that, but I think Winegard said something about 100% stronger using the Wingman, which would make it 3dB.
But I still think your best option is to see what your neighbor is using, and give their antenna a try with your tv. It might even be your tv, as all tuners are not the same.
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