I have similar problems with city sites living here in lake city, I have tried different threshold settings, multiple antennas, no antennas and everything in between. Sometimes it’s not too bad and other times it’s worse! County site will not give you Erie Fire tac channels or Millcreek tac channels they seem to be on the city sites. I attribute most of the problems to location and simulcast issues. Would a sds200 work better I don’t know? I am also trying sdrtrunk Software with a single usb dongle. And am able to hear city sites just fine! Not bad for $25 hardware! As the software developed and gets better it will be a cheap way to listen.