this magnetic probe they use, you think it's hall probe -> frequency analyser? perhaps a hall sensor + arduino would work ? (sorry im not good with electronics

this magnetic probe they use, you think it's hall probe -> frequency analyser? perhaps a hall sensor + arduino would work ? (sorry im not good with electronics :D..?) i'm wondering how to get the magnetic signal into my hackrf or arduino. how to catch it? they just mention using a probe, and i see on the picture some device which looks just to be hooked up to antenna cable?