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It's pretty amazing to me that in 2021 there is no basic, hand held radio (non-HAM) that can't reliably cover a 5 mile range in a place as flat as Florida.
Then again my knowledge of such tech is virtually nonexistent, which likely explains my confusion.
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You shouldn't be.
Start looking for cell antennas. They are absolutely ubiqutious.
In order to cover a county (one that's not heavily urbanized) you need a repeater with an antenna up hundreds of feet (think 400-500 feet up) and 100 watts of power @ the base of the anntena ... if you are in the UHF range. Higher the frequency, the more power you need.
Good 5 watt uhf portables should just manage, if it's LOS (ish) 2-4 miles. Significantly less if it's not LOS. Pine tree needles are almost a perfect quarter wave for UHF and so soak up signal. Etc.
You might have better luck with VHF, but I dunno if the FCC will let you operate in that range, esp not at 5 watts.
LMR stuff kicks butt on range too, but the FCC forces you to dance their tune to have it.