The Sensar was available in both amplified and passive versions. They're up to the Sensar IV now, which is amplified, and includes the UHF kit. May be a dumb question, but how do you know you have the passive version and not the powered, but missing the power injector? If your neighbor has the Sensar IV and it works as you'd like yours to, Winegard also sells just the upgrade head unit and also the power inserter, which totals around half or so of what a complete unit would cost.
But I would start with pulling a coax from your neighbor's antenna to your tv, just to make sure it's the antenna and not your tv. Or move the tv to their RV for the test. Either way (shorter coax is always good, of course).
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