It was simply a POC demo, not a viblre teechnology
https://www.wired.com/story/cypherpunks-bitcoin-ham-radio/?mbid=synd_digg&utm_source=digg&utm_medium=email"In truth, there are restrictions aplenty when it comes to sending bitcoin by radio.
First off, legalities. To stay on the right side of the law, some countries require you to be a licensed ham operator, and even then you’re unable to send any encrypted messages or use the airwaves for commercial purposes unless so licensed. At this point, it’s not yet clear which governmental task force will join the SEC and co in clamping down on illegal apocalyptic bitcoin-via-radio transactions.
Since legal restriction is the mother of all invention, Novak and Patterson circumvented this by broadcasting their experimental, non-commercial wallet encryption sendoff via public cypher.
Then there’s prepping it all. For this to be a viable – albeit last resort – solution in an actual nail-bite situation, sender and receiver would have to set it all up in advance. Novak and Patterson were able to execute their experiment by communicating and collaborating in lieu of the transfer"