Signal triangulation. You compare strength of a broadcast from a few locations to deduce broadcast location. In the US there’s a volunteer group that does this

Signal triangulation. You compare strength of a broadcast from a few locations to deduce broadcast location. In the US there’s a volunteer group that does this for the FCC, I forget the name. https://wfebb101.com/faq/how-to-triangulate-a-radio-signal.html https://wfebb101.com/faq/how-to-triangulate-a-radio-signal.h...