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2.4 Ghz wireless is good if you have a clear line of sight to each transmitter. Access point with omni-directional antenna can be had for under $300.00. Subscriber units (that’s what you need at each transmiter site) for about $200.00.
A better and easier distribution way is subcarrier audio on an FM carrier. You would have to get friendly with an commercial FM station and lease an audio subcarrier. With an special SCA radio you can pick up your signal wherever you can hear the “big” FM station.