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For more background information you might try this link:
You might try to contact a local amateur radio club. Even if your area does not have one, look for one in a nearby city. It is not unusual for these clubs to have widely dispersed members perhaps in your area and you might find a ham who would be willing to lend you a hand with this.
It does sound as if you will need to go the multiple transmitter route, but even one transmitter on the air is a way to start, assess and demonstrate the feasibility of the project. Perhaps if this is successful then more transmitters can be added as funding and resources permit.