Let's not forget Tesla
Well you did show a picture of a nice Tesla coil.
Back in the early-mid 80s some techies in Texas Instruments supposedly stuck a Tesla coil circuit onto a chip. The thing turned out to be a broad band RF receiver and could rather nicely suck small amounts of usable power out of ambient EM noise. Which is probably why since then I've never been able to find anything more about it (hunting for my tinfoil hat to protect the conspiracy theories).
It was published in Science weekly in the above time period. Hopefully not an April 1 issue.