I dunno what the difference might be, but I’ve used an RF frequency counter before. It basically shows what frequency it’s picking up, which is all over the place until you get closer to a source… then it settles on, say, 2.4ghz… but these are somehow super rare these days. I have an old one that goes to 5ghz and down to 100khz. You might also be able to repurpose a radio scanner… like the kind used to listening to police etc… I could tune in my old 100mhz 486 CPUs on the FM radio dial and also on my radio scanner and listen to the music of the bits.
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