You will need a DC power supply and a base station antenna.
The power supply should have an output between 12 to 14 volts DC. The power supply must be rated at 3 amps or more.
You will also need a CB base station antenna. They are mounted on the outside of the house, similar to how a TV antenna is mounted. DO NOT use a mobile antenna designed for a car, it will not work properly and will provide poor performance. Indoor antennas also provide poor performance. A properly mounted exterior base station antenna will provide very good performance.