After months of wondering if anyone was using 80m at all, and finally shifting the frequency of my Ft. Tuthill 80, I have at long last heard strong signals aplenty. I must have copied at least two dozen calls around 3.530 MHz all frantic to work somebody. Unfortunately, I don't know if I could hear that other station or not. I certainly didn't copy any call that I would think would be rare.
I conclude from this that my antenna needs improvement. Since I already knew that and am planning to do something about it, that's a convenient conclusion.