Just remember there are different radio services
CB; 5 watts in 4 out (to the final) 27 MHz decent range antenna 9' for best resluts
FRS: Low power 400+MHz short range
GMRS: Several optionas Higher power longer range License required
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I'm an Extra Class Ham Radio operator. I can run up to 1000 watts DC in (It gets confusing when we talk power out) from just above the broadcast band to just short of.. well actually above visible light (though I don't have the hardware to do it) Though power limits exist in some bands and there are "Bands". Farthest i have ever talked was Michigan to Hong Cong (Half way around the world) but I kind of "Cheated" on that
Radio to Radio I've talked to about half the country and typed to about half the world (Same radio, Same antenna, 100 watts talk 30 typing. Yes Digital IS better than analog)
Though when I got my license you needed to learn Morse Code. That requirement is history.