On Mon, 15 Apr 2019 16:58:47 -0700 (PDT), True North
wrote:

I was thinking of getting a set off and on for the last 15 or more years. They started off with modest range claims but seemed to get more powerful maybe up to or so kilometers. Even wondered if they would help communicating with the wife while backing the boat into the driveway. She likes to hide in my blind spot while directing me.

The range claims jumped when the upped the allowable power to 5 watts.
Five watts and a decent antenna should get you to the horizon in open
country.