Found water dripping out of the N connector when I disassembled everything. I think its getting in where the plastic joins the metal base. I’ll let it dry out inside for a few days and then try to reseal it.
Have pressed the Maxrad unity gain antenna that I normally use with my portable setup into service for the interim.
Following several days of heavy rain, my performance plummeted. My antenna is pretty inaccessible so I could not get to it to examine. Then we had a very cold spell, well below freezing, and my range improved, the best ever! With a thaw, I again lost range, but as things dried out, performance returned. Hope to change out antenna next week!