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Here is my crystal radio being used to light up 10 LEDs. I would estimate my antenna to be over 200 feet long. I used a kite to hang it over a tall pint tree.
If your interested in purchasing this book here is link to the publishers website. [ Ссылка ]
A few years after making this video the author of a book on crystal radios allowed me to interview him at this link. [ Ссылка ]

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