Get at least your technicians class amateur radio license. This will allow you a HUGE number of options that not even commercial radios can match. There is a learning curve, a 35 question FCC exam, you'll gain experience on how radio works, antennas, protocol, etc. there are thousands of amateur radio "repeater" stations free for your use, that will extend range many miles.
There is no "best radio" for what you want, but with a little training, you can create your own workable system.
A satellite phone will allow you to make contact if you want to pay the subscription fee, anywhere in the world. Sat phones can also be rented.
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