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A mobile CB radio.
No! CB power amps are very unlawful, and they can interfere with legal radio communications. (Like Amateur Radio)
You don't. It won't work.
No, and it's actually illegal to do. CB radios come from the factory transmitting four watts, which is the legal limit.
Yes, many people in the word still use a CB radio. Truck drivers use CB radios each day.
Four watts out of the box, which is the legal limit set for CB radios by the FCC.
Public service agencies don't use CB radio for official communication.
Sure. Always have been. No license required anymore.
Then your radio probably isn't grounded properly.
No, the cb radio only works on the citizens band, aircraft use licensed private frequencies or faa regulated ones.
Transmitting over four watts on a CB radio is actually illegal, thus, using a linear amp on a CB is illegal, as well. A linear amp attached to a radio (for argument's sake, we'll assume it's on a type of radio on which the application is legal) simply amplifies the power output. The radio transmits into the amp, the amp amplifies the signal, and transmits it to the antenna.
I do not see how a CB radio could interfere with VoIP service. If the CB radio is creating interference on the line, check your telephone. Or even check your broadband modem to ensure that you are not creating packet loss due to the CB radio.