This is single hop. Much farther possible with 3 hops.

https://hackaday.com/2023/09/15/new-lora-distance-record-830-miles/

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According to the article, that was dependent on the weather and the ocean. I'm aiming to go over land, including a small mountain range, in all weather.

Still, it's encouraging to read that at least one end of the link was not way up high, but rather at sea level. In my local testing, elevation was very important.

I saw HAM operators can go up to 10W of transmission power, but of course that would mean no encryption. ☹️

Spoke to an FCC rep about this. The default encryption everyone unlicensed uses is fair game for hams at full licensed power, if you use the key that ships in the firmware default enabled. Other keys are forbidden though. By their logic that default key is "widely published." Other keys you roll yourself for real privacy are unlicensed power levels only.