I have never used radio but always found it interesting. I'm aware of several examples of successfully broadcasting bitcoin transactions via radio but this seems to be more to extend the network for special circumstances like emergencies etc.. because presumably, the user could broadcast a transaction but not keep the blockchain in sync. At least this is my current understanding.

I'm not sure if a mesh radio network would scale in terms of bandwidth. And as the only support for communication of Bitcoin data my concern is that it would be a centralizing factor in how blocks are propagated. But as a redundant source of confirmation (you would only need to download the blocks hashes) or as some sort of central proxy that anonymizes the sender of the transaction I could see it being a good solution to have around.