An antenna system mounted in a vehicle, according to the present invention, comprises: a radiator for transferring, through an upper opening, a signal which is applied through a lower opening; a coupling patch disposed on an upper substrate so as to be spaced apart from the upper opening by a predetermined interval so as to enable the coupling of the signal which has been transferred through the upper opening; and a first antenna connected to the coupling patch so as to make surface contact therewith, and comprising a shorting bar for connecting a ground layer of a lower substrate. The antenna system may further comprise, apart from the first antenna, a second antenna disposed in the antenna system.