Ran into an acquaintance that is actually a tv station chief engineer this weekend. I couldn't do anything yet, as it's been way too windy to play with an antenna on the roof.
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His suspicion is one of the cable has a shield wire strand contacting the core wire. I can easily pull the living room tv off the splitter and check the other two TV's. I've had other projects taking up my time this weekend. Because the behavior didn't change when I disconnected the other TV's from the splitter, it has to be in that line, and that wire and installation is all me. Can't blame Quailridge for that :)
There is two other possibilities, the antenna has a "short" and he advised me to look carefully at the cross over elements to make sure one isn't shorting out. The short lead on the antenna to the balun also hasn't been changed out.