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I agree that 800 MHz isn't always the best way to go, especially if you're trying to cover a large area.
A few years ago, the state of South Dakota went to a statewide, digital trunked, VHF band (150 MHz) radio system that tied the entire state togehter. They were able to cover about 95% of the state with only thirty some towers. The advantage to this system is that the radios were still able to interface with the older, analog VHF systems (such as mutual aid) for those that didn't want to switch.
A few years ago, the state of South Dakota went to a statewide, digital trunked, VHF band (150 MHz) radio system that tied the entire state togehter. They were able to cover about 95% of the state with only thirty some towers. The advantage to this system is that the radios were still able to interface with the older, analog VHF systems (such as mutual aid) for those that didn't want to switch.