Clever crystal set trick, Mike.
Crystal Radios "Stay Tuned" Crystal Sets
Did some darn good crystal sets when I was a kid, DX'ed the Wolfman from Sac'to despite strong local stations. Also built vacuum tube regens and superregens. The "exalted carrier BFO" crystal set trick I hadn't seen done before, but the physical principle is the same as doing a receiver using an NE602 for direct conversion. I've done both DSB and SSB NE602 longwave beacon receivers, the little handheld SSB was raced against a very expensive rig at the Redwoods LOWFERFEST about 1988 and was very nearly as good. Probably would have been better had I used critically dampened audio bandpass filters. Redwoods is also where I demo'd synchronously demodulated BPSK earth conduction communication straddling the Schumann fundamental.
This may come as a shock to you, but it isn't supernatural majick, much less does it have anything to do with LRL's. There are people who actually get paid to design and build stuff that actually works, it's called "engineering". Resonance in particular has been understood for I suppose about 200 years, and anyone who does RF engineering understands it and doesn't get all gushy superstitious about it. In interviewing engineers, I ask 'em about it. Shockingly most EE grads nowadays don't know what kids knew back in the 50's.
That Meyl guy you're so enamored with, he's a stage performer, just like Amazing Randi was for so many years. Skilled in the art of taking something quite ordinary, and convincing gullibillies that they're witnessing something fantastic, almost supernatural, and beyond the ken of mere mortals. Fifty years ago he'd have been laughed off the stage, but these are not smarter times we're living in these days.
[EDIT] This one's my favorite, since it wastes less than 15 minutes:
[ANOTHER EDIT] Since Mike's fascinated by WiTricity, here's the link:
http://witricity.com/technology/
The technology is ordinary near-field radio engineering, not supernatural majick. Although company's hype regarding its potential application is, well, a bit overenthusiastic.
Nikola Tesla was history's first real radio engineer, but he wasn't the last. His actual technological impact was in AC power distribution, obsoleting Edison's DC based power distribution systems. Tesla was a showman himself with the RF stuff because he was trying to drum up financing for his RF stuff from which he'd been sidelined for business and political reasons. The result was the evolution of a Tesla worship fan club among people who don't understand radio engineering but who do love to pretend that science fiction is real. Engineers who design and build stuff that actually works respect Tesla as an engineer but don't go off the deep end wanting to believe he demoed science beyond the ken of mere mortals. It's the people who can't produce anything that works who comprise the Tesla worship fan club. And that, my friends, is why showmen like Meyl love to invoke Tesla: there's a ready-made audience wanting to be conned.
[YET MORE EDIT!] Notice that neither the con man Meyl nor the exaggerators WiTricity make any claim that their schtick has anything to do with LRL's. They probably never even heard of LRL's. All that is just Mike's imagination.