Very easy. "Huff Duff" is WW2 technology. https://en.wikipedia.org/wiki/High-frequency_direction_finding https://en.wikipedia.org/wiki/High-frequency_directio

Very easy. "Huff Duff" is WW2 technology. https://en.wikipedia.org/wiki/High-frequency_direction_finding https://en.wikipedia.org/wiki/High-frequency_direction_findi... The units used for detecting and locating clandestine transmitters started WW2 as large truck mounted facilities to hand carried units (with antennas) that fit inside suitcase-sized containers. Modern ham groups engage in transmitter hunting as part of organized events. Bunny hunting and fox hunting are alternate names for such activities. https://en.wikipedia.org/wiki/Transmitter_hunting https://en.wikipedia.org/wiki/Transmitter_hunting How to do it: https://www.youtube.com/watch?v=PN-c5DQFuhI https://www.youtube.com/watch?v=PN-c5DQFuhI Governments use much large automated facilities: https://en.wikipedia.org/wiki/Circularly_disposed_antenna_array https://en.wikipedia.org/wiki/Circularly_disposed_antenna_ar... https://en.wikipedia.org/wiki/AN/FRD-10 https://en.wikipedia.org/wiki/AN/FRD-10