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Listening radio with grass

ateijeiro0Cited 15× on HN, 2017–2026
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demo · general · evergreen · 2017–2026 on HN

Two experimenters hold blades of grass near a radio transmitter antenna and hear the AM station through the arc between antenna and grass. It is a short, informal demonstration of unintentional AM demodulation.

HN commenters bring it out whenever AM radio, strong transmitters or accidental demodulation comes up, as the classic example of grass playing radio.

12 comments from Hacker News

@HPsquared2026-06 · in “The BBC switches off its oldest service”

With enough power anything is possible... If you put random vegetation directly on the radio mast (NOT recommended!), it makes sound directly- ▶ this video

@acchow2026-03 · in “Closure of the Weatherradio Service in Canada”

We probably shouldn't deprecate AM for emergency broadcasts given you can listen to AM radio with grass ▶ this video

@HPsquared2025-10 · in “Electromagnetically Induced Acoustic Noise”

(too late to edit) I remembered this example of "unintentional amplitude modulation" of a strong AM RF signal: touching vegetation against a (presumably AM) radio mast. "Listening radio with grass" ▶ this video link

@MichaelRo2025-03 · in “Can Earth's rotation generate power? Physicists divided over controversial claim”

Well, I'm expecting an average case, not "playing AM radio with grass", because in the vast majority of the cases, antennas won't be situated within a few meters of the radio tower: ▶ this video

@tokai2024-09 · in “What happens when you touch a pickle to an AM radio tower”

Reminded me of this old classic video of some intrepid guys getting tufts of grass to play music with the help of a radio tower. ▶ this video