I’m guilty of calling CQ SOTA over and over and not hearing anyone because I was being drowned out by an FM transmitter. I tried activating Blue Mountain, W4V/SH-030 this Spring and couldn’t hear a thing due to the S9+ noise my Yaesu VX-7r was picking up. I now have an FM Broadcast filter and will either use that or HF on my next attempt. The same HT worked fine at a peak on Skyline Drive, both as an activator and ad hoc chaser.
Chris