They most likely did a sting. You can triangulate the radio waves. I do it to find xfinity wifi hotspots to leech off of. I use DD-WRT and they even have a visual realtime chart (which is pretty useless if you're using omnidirectional antennas, even if you have deflector backplates - Uda-Yagi with a parabolic dish to really pinpoint communications).
Label: no hate