Related, the FCC still maintains a network of monitoring stations around the US. Back in the day they were manned, now they're automated and remotely controlled

Related, the FCC still maintains a network of monitoring stations around the US. Back in the day they were manned, now they're automated and remotely controlled. There's a list of monitoring stations here: https://www.mdarc.org/regulations/fcc-monitoring-stations https://www.mdarc.org/regulations/fcc-monitoring-stations (And yes, GPS-linked direction finding units are definitely a thing that can be purchased commercially. They're big in the amateur radio world for "fox hunts" - competitions to try and find hidden radio transmitters.)