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Who was using what polarity at the time? Signals should have been constant if you were both using the same polarity at the same time unless the path was a long local path,50 miles or more, and near sunrise or sunset. That can upset things a bit sometimes. If only one of you, most likely him,  was using both polarities at the same time then that would account for the 3 dB loss I pointed out above. Also unless the length of coax cables was properly cut to allow for proper phasing then signals could cancel out with the amount of cancellation depending on the amount the two signals were out of phase. It's not a simple matter of screwing two cables into a TEE connector and it working right. The bottom line is that no single polarity or combination of polarities is going to be the best ALL the time but dual polarity at the same time is the best compromise and really pays off when the band is flakey and signals are fading up and down. that's the whole reason I configured my Shooting Star to be able to operate just V, just H, or both. I used both about 90% of the time.