Channel 19 is the most commonly used for general talk, chatter, etc, throughout most of the US, although Channel 17 seems to be more popular for that purpose in California.
CartoonNetwok.
CB radio ch 9
channel 9
Channel 40 Frequency: 477.400 Simplex Highway Channel
Supposedly, they monitor Channel 9, but it's really rare to find police officers/police agencies which actually do. If a police officer is monitoring the CB radio, they're more likely to be monitoring Channel 19 than Channel 9.
Public service agencies don't use CB radio for official communication.
If you are asking about CB (Citizen's Band) communications it is at a frequency of 27.03500Mhz.
Sure, you can use it; but it might not do a very good job. If you're listening to AM, you're receiving between 0.5-1.6 MHz, whereas FM is coming to you at 88-108 MHz. The CB antenna is designed to be resonant at 27 MHz.
CB radios and scanners are available from BestBuy. For instance, Midland CB radios cost a price of $78.98. In contrast, the Midland 40-channel CB radio costs $54.98.
Most truckers that are on the road use channel 19 to get in touch but ussually move to a different channel to talk to someone privatelly.
Except for the UK most of the planet only allows use of 40 channels for CB. Big fines and all sort of trouble goes to those who modify CBs to operate outside the 40 channel limit. Frequencies above and below CB are used by other people who send Police around to those who do not respect the limits.
A CB radio is a Citizens Band Radio. It has 40 channels and is used for short distance communication. CB radios are mostly used in semi trucks so that they can communicate with other truckers, weigh stations, home base, and to find out the weather. A CB has different channels for different things while you are on the road. Channel 9 is for emergencies, channel 19 is a highway travelers monitor channel, you can get information about road construction, police blocks, and weather. Some of the features that a CB radio has are: Automatic noise limiters, a built in pa system or "bullhorn", Volume controls, and many microphone features.
Used, about $40 - 50 is all you'll get out of it.