The Internet of vehicles (IoV) is an important part of mobile communication system with the development of Internet of things (IoT). A novel multiband automobile antenna is proposed, which can cover all frequency bands for the long-term evolution (LTE), the 5th generation wireless systems (5G), the wireless local area network (WLAN) and the dedicated short-range communication (DSRC) (from 690 MHz to 944 MHz and from 1.46 GHz to 6 GHz). The antenna is designed based on the monopole antenna, and the impedance matching performance of the antenna is improved by loading the toothed capacitor and the impedance matching disc. The simulation results show that the automobile antenna achieves good impedance matching in the working bandwidth and obtains omnidirectional radiation pattern in the horizontal direction. The electric field distribution of the antenna placed on the vehicle roof is simulated to evaluate the network performance of the antenna system in the urban environment. The transmission coefficient of the transceiver system using the automobile antenna is also analyzed based on the electromagnetic simulation results and statistical model. The blind area of mobile communication system is effectively covered with the automobile antenna, which could be used to connect the LTE cell and the IoV system.