The companies get permission from the FCC of where to run their products and comply with requirements. Even on 11m, between the channels and above, there are allocations for none CB uses, that the "freebanders" are operating on, and shouldn't be. There's actually HF 11m - 10m being used for stock trading data transmission. The Ham bands have restrictions of what can be transmitted where with in their allocated bands, find an Amateur Band alocation chart, and you'll see. There are areas for data transmission in the ham band, for use by hams. Ham bands run from 135kHz up to 1240mHz. There's a reason for frequency allocation and planning and sharing.