Jerry - I found the problem with my common-mode! Metric thread coax jumper AND it didn't even have any teeth inside - just flat. I guess depending on which way the wind blew, or maybe temperature expansion, that got flaky. Arrrgghhhh. Thanks for making me dig. I removed the commercial choke at the rig, and no problems. Although I guess I'll leave it in for engineering practice. It worked so well, that it cured a related antenna project issue that I'll put into it's own thread. tnx agn !