Fifty years ago the english had VHF direction finders in towers so they could get an instant bearing on a radio transmission. I cannot understand why we have not used them.
Alice Springs Tower had one. Was taken out circa 1995. Apprarently it was blamed as the source of interference on a local AM band radio station.
Can't understand how a RX can do this but anyway it was removed.
It was very handy, especially when aircraft called inbound on the 180 Radial, and turned up entering the ciruit from the North. When it was taken out, we used to ask these guys what their departure AD was.