Fascinating. This reminds me of the WWII novel All The Light We Cannot See where the young German soldier is tasked with locating illegal radio transmissions by

Fascinating. This reminds me of the WWII novel All The Light We Cannot See where the young German soldier is tasked with locating illegal radio transmissions by placing receivers at different places and using trigonometry calculations to estimate the distance and direction of the source. Of course, the culprits would invariably be killed when found, leaving the boy with a deep sense of guilt.