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Your idea is good and I read where this is being developed. I don’t have the reference in front of me but I think it was describe in Scientific American within the last 9 months.
This would involve the use of unlicensed repeater stations placed so that the signals would propagate through the mesh very much as is done with the internet. The address tags would route the traffic to the destination. Pretty clever isn’t it.
I know for a fact that a major telecommunications firm was working on this about 5 years ago so they could provide phone service without the need for wires. Since I have been out of the loop for this time, I don’t know where it has gone, but then the problem was that they could not manufacture their microwave product with a high enough production yield to be able to launch the product.
Part 15 allows operation in the 900 MHz band and also the microwave band. There are available many such modular devices which an experimenter could apply to realize your idea. I am now investigating 933 MHz. transmitter and receiver modules (Linx Technologies) which are available in the $30 range for some other uses, but they do support analog and digital transmission and could be used as you propose.
Your idea is good and is an interesting read. Thanks for sharing this.