I need a handheld CB Radio with the furthest possible range, what is the best one? ?

Can someone recommend the best CB Radios that will go the furthest range? I need 2 that will go at least 6+ miles in a urban area. Is there such a thing? Not regular 2 way, as I understand CB radios are more powerful correct? If there is also any security features / hopping to them that would be nice. Thank you.