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I think it would probably just be simpler to use a mattress with no springs, of which there are many on the market today.

A 100 MHz wave is 3 meters long. What part of a bedframe/coilspring is 3 meters in length?

I’m not saying the article is right (it sounds like nonsense to me) but you do get resonance at half and quarter lengths as well.

Even a quarter of three meters seems big.

My darn moral compass has prevented me from being rich in so many ways, including this one. Sigh.

No kidding.

It could be a thin metal foil that comes in rolls and alternatively would be usable to create a protective hat!

It'll never catch on unless it's got other uses. Consider the kitchen--