Hell - I bet you could find that with a $12 RTL-SDR and a home built antenna plugged into your laptop - if you were curious and suspected there was one nearby...
Never underestimate the amateur radio community. They hunt down radio pirates, emitters of interference, and hidden beacons for FUN! With the right antenna and a halfway decent receiver, it is not too difficult to hunt down the source of a transmission.
https://en.m.wikipedia.org/wiki/Transmitter_hunting