Lots of complexity with that question. CB is voice, this is digital. Typically, digital communications can "travel further for a given watt" because the power

Lots of complexity with that question. CB is voice, this is digital. Typically, digital communications can "travel further for a given watt" because the power is "focused" on a smaller amount of bandwidth. CB can propagate (be bounced off of layers of the atmosphere) to get a significant distance, but it depends on atmospheric conditions, time of day, etc. So not reliable. I've talked to Uruguay on my ham radio on 4 watts (HF, 10-meter band), but once again, I can't do that reliably/every day. LoRA is 900mhz (in the US) so you don't get atmospheric propagation.. but with the right antenna (height is might!), you can get several miles in a city environment with only a watt or two... so forming a mesh is what allows you to achieve further distances. It is not legal to encrypt CB or ham radio communications.