PURPOSE: A retractable antenna for a vehicle is provided to prevent the deterioration of reception sensitivity at a blanket area by changing the length of an antenna. CONSTITUTION: A spiral groove is formed on a cover(110). A feeder conductor(120) receives an input signal from a feeding circuit of a vehicle. A connection conductor(130) includes a penetration hole and is fixed to the upper side of the cover. A main radiator(140) is formed on the surface of the connection conductor and is comprised of a helical conductor. An inner conductor has a screw thread corresponding to a screw groove. The sub radiator has the preset length in the length direction of the main antenna.
