what do you think about the radio frequency spectrum (although Satoshi in the white paper says BTC is an electronic payment system) it is only sending a few bytes through waves to be able to sign and verify transactions in that radio that in the end will be connected to the blockain network in some way that right now I don't know.
It's certainly doable and has been done before. Check out the following links for example:
https://www.shtfblog.com/how-to-send-bitcoin-over-ham-radio/https://nitter.net/Coinsurenz/status/1052022462790033408Probably the best way to do it would be to set up a mesh network via something like GoTenna (as the user in that Twitter link above did), with a person with an internet connection on the other end. Then you can cover a wider geographical area and anyone can send a transaction via the mesh network to the central point of internet access in order to be broadcast.
Note that you aren't sending data which needs to be "signed and verified" via radio, as you put it. Each user would sign the transaction they want to make locally on their own device, and would then send that signed transaction through the mesh network in order to reach the person who can broadcast it on their behalf.