The most important rule of CB radio has to do with safety. Officially speaking, Channel 9 is the CB radio emergency channel.
Read moreWhat is the best CB channel to use?
Any authorized CB radio frequency is open to all, but some have agreed-upon special purposes. For instance, channel 9 is for emergency use, and channel 19 is used by truckers to report on traffic conditions. Channel 19 is at the middle of the bands, thus has the best antenna efficiency.
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