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I still think you’d be surprised with the frequency response of a CDMA cellular service. There are several available, some are offering TDMA which isn’t going to work as well for you. GSM is gaining some popularity and call quality wise is better than TDMA.
The problem you have is that I don’t see any way you can use part 15 equipment and accomplish your range goals. Not only do you have power limitations, but finding an open frequency in your area would be difficult.
The 13 Mhz band is so narrow that it can’t carry too many channels, especially if you want good audio frequency response.
The entire 49 Mhz part 15 band shares with cordless phones. 27 Mhz is right next to the CB band and is rather fickle about consistent range.
The 175 Khz frequency is part of what used to be know as the “forgotten band” as it had very little use and almost no equipment made for it. The best range I remember for it was about 25-40 miles during the day and that required building some special equipment for transmission and reception. At night it was almost pure chance with what range you’d have.
Above about 300GHz is infrared light.
There’s an interesting chart of frequencies at