The purpose of the work is the modernization of the radiosonde tracking ground radar station for contact monitoring of the atmosphere. The paper proposes the design of the antenna system for the radar «Vector-M». The antenna system consists of a main antenna array necessary for the formation of a narrow beam and tracking the radiosonde at large distances and a small one, necessary for tracking the radiosonde at the initial stage of the flight. Calculations of the predicted range of the radar have been completed.