CB is line-of-sight, isn't it? It's mostly used by freeway truckers for very short-range comms that you don't need to broadcast across the entire state (accident/speed trap ahead/nearby Hooters fails health code inspections).
It has a long wavelength. 11 meters, and that means it will propagate like "Short Wave" and HF (high frequency) commercial broadcasts tend to do.
The line of sight signals happen at much higher frequencies. VHF and higher. (GHZ)
They are all using SSB though I think. Not super common in handhelds.