Yes, it happenned to me on a multi-summit day trip.
I made quite easily 4 CW contacts on a first summit, but kept calling CQ for another 15 minutes and got no answer back despite a few RBN hits. I remember signals weren’t strong but present. I thought: bands dead.
I moved on to the next summit. I called CQ for an hour on several bands, called my friends… no contacts made and barely any RBN hits. I thought: bands still dead. This was by night and in the snow. It was a tough decision to pack-up.
Once back home, I realized the antenna wire was ripped off the 1:49 transformer (EFHW).
So it appeared the KX2 tuned the RG316 feeder and 1:49 transformer and this “antenna” did radiate a bit
Sorry for the off-topic