It's not for a CB radio.
Just a regular stereo. Just "LOOKS" like a cb antenna.
The quick release is for removing it while offroad or auto car washes. That's all.
Here is the discription from the sale add...
A powerful AM/FM antenna with the cool looks of a CB antenna. Includes a custom machined ABS plastic insulator bezel and a stainless steel quick release coupler. Antenna is easily removed for automated car washes, off-roading and anti-theft. Improves signal strength and is an excellent replacement for damaged or missing antennas.