1. The outer contour of the cover plate is streamlined. The cover plate covers the bottom plate, and the cover plate and the bottom plate are combined to form a cavity with a single opening. The antenna tuner is fixed on the bottom plate, the rotating motor is fixed on the antenna tuner, the output end of the rotating motor is connected with the antenna, and the pin output of the antenna tuner is connected with the input of the antenna.
2. The antenna tuner, rotating motor and antenna are located in the cavity formed by the cover plate and the bottom plate. The bottom plate is installed on the fuselage, and the joint of the cover plate and the bottom plate faces away from the flight direction. When the plane is flying, the streamlined cover can prevent the antenna from being damaged by excessive wind, and the rotating motor can turn the antenna in multiple directions to receive signals better.