Actually the UHF connector is a terrible discontinuity. Nominal impedance of 34 ohms and about 1.3:1 VSWR at 500MHz. Putting them at each end of a length of 50 ohm coax is a textbook transmission line reflection diagram problem. So what is the SWR right now? You could just add a short length of wire, maybe 3 or 4uH of inductance, to bring it back into resonance. That's the great thing about VHF and UHF, it won't take much to move things.
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