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RE: How the Water to Electricity Petros Zografos Free Energy fuelcell system is working from hellagen.gr
These RF to DC harvesting boards go up to 6 GigaHz already:
http://www.rfdiagnostics.com/product/rfd102a-test-board-assembly/
Here is a PDF File about one of these RF to DC Power harvesting circuit boards with diagrams:
https://www.cornestech.co.jp/tech/wp-content/uploads/sites/2/2017/02/rfd102a.pdf