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What is the maximum range you need in that mix of cities?
Obviously, the best frequencies woudl be the ones that have the highest FS limits, but it also depends on what else might be sharing your frequency. I don’t know anything about the 13.553-13.567MHz band. Maybe it’s cluttered with other potentially interfering transmissions?
The 902-928MHz and 2400-2483.5MHz bands seem good. Those relatively inexpensive “STL” modules operate in these bands. With a couple of directional antennas you should get exceptional range and signal quality and relative immunity from cordless phones and whatever else operate on these bands. I guess it wouldn’t be too cool to have a private phone conversation bleed into a church service! If you can find an STL that operates spread spectrum, then you can pretty much rule out embarassing interference.
Speaking of cordless phones, I wonder if anyone has ever done some serious experimenting with adapting them to directional antennas. I bet the range could easily increase to several miles. Just a thought.