PURPOSE: To prevent the noise in a vehicle from being propagated to the second receiver connected to the second antenna element provided above the first antenna element by providing a noise reducing means on a feeder between the first receiver and the first antenna element.

CONSTITUTION: An AM/FM wave receiving antenna part 6 is attached to a shared motor antenna attaching part 22 of an automobile metallic body 5, and a quasi-microwave communication antenna part 4 is provided in a front end part 29 of the antenna part 6 together with a resin rod 23. Though the noise in the automobile will be propagated to the AM/FM radio receiver side connected to the antenna part 6 through a coaxial line 1 connecting the antenna part 6 and a quasi-microwave communication transmitterreceiver, this noise is cut off by an inductor 50 constituted by winding the coaxial line 1 around a ferrite core 34. Thus, penetration of noise to the AM/FM radio receiver is prevented without losing the merit of a shared antenna equipment.