OK, I do not (yet) have a station like the big guns. But I am making progress with HSMS.
Question could there be decodeable FSK441 signals on 6 meters that I could be missing, but I could hear if I added a preamp on the mast? Is there that marginal a difference in strength that a pre-amp will make non-decodeable (or undetected) signals suddenly pop out of the noise? Is it analogous to other signals that will be detected better with preamps? Or with HSMS is that analysis invalid?