GMRS would be the best, cheap option...but range is limited.
Ham radio is great, IMO. There are already ham radio organizations dedicated to emergency comms, so there is a wealth of expertise available. The basic "tech" license is fairly easy to get (if a 6th grader can pass the test, you can do it fairly easily). Technician licenses allow a wide range of VHF/UHF comms. The higher licenses also allow HF.
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