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This Tiny Radio Lets Me Send Texts Without Wi-Fi or Cell Service
(www.howtogeek.com)
This is a most excellent place for technology news and articles.
Companies are starting to manufacture repeaters and they are not that expensive. You can get one for about 100 Federal Reserve Notes.
Sucks you can’t charge it and have to instead go to a central bank to exchange minted coins for notes that you can exchange for the commodity that is the radio.