Just to follow up on the problem, so many times people start at thread and never report back your findings after they fixed it. I know ideally you would check one thing at a time to isolate the problem but in the interest of getting the problem resolved this is what I did. Took the antenna off and checked tab. Removed nmo mount, checked everything and reinstalled. Cut sma connector off and reinstalled a new one. Bad news is im not sure which of these was the problem. Good news is it seems to be resolved. Antenna is performing equal to if not slightly better than the mag mount. Seems like the continuity checks I did both with and without antenna installed would have identified a problem with any of the items I mentioned. Who knows!
I want to thank everyone who took the time to help.
Randall
