Nice idea.
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SolderSmoke Daily News — Ham Radio Blog
Serving the worldwide community of radio-electronic homebrewers. Providing blog support to the SolderSmoke podcast: http://soldersmoke.com
Alas, no. The basic physics says you’ll get virtually nothing useful from the device, even assuming it’s very efficient. The videos are (at best) misleading, and it’s notable that they don’t serve up even basic maths. Seethis blog entry, but the raw truth is you don’t put much energy in when you raise a few rocks up through a metre or two, so you won’t get much back. 73s, Rupert G6HVY