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Solar antennas. 70% efficiency

 
Posts: 1400
Location: Verde Valley, AZ.
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No, you can't make your own. these are nearly nanoscale.

http://today.uconn.edu/blog/2013/02/uconn-professors-patented-technique-key-to-new-solar-power-technology/

http://peswiki.com/index.php/Directory:Solar_Rectenna_by_Brian_Willis
 
Oh sure, it's a tiny ad, but under the right circumstances, it gets bigger.
Willow Feeder Bundle: Movie, eBook and Plans
https://permies.com/wiki/359686/Willow-Feeder-Bundle-Movie-eBook
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