With the advancement of electronic warfare, the interference and anti-interference technologies for unmanned aerial vehicle (UAV) have garnered significant attention. This paper focuses on one-to-one air combat and explores the design of stealthy deception attacks against an enemy UAV system. Given that the UAV directly connects with its ground control station and receives information and commands from it, the attack signal is introduced into the communication channel between the UAV and its ground control station. To ensure the effectiveness of the stealth attack signal, it must avoid detection by the anomaly detector. The design of an effective stealthy attack signal involves using the residual of observations and the state estimation error. The stealthy attack signal is then crafted to ensure that the residual, whether under attack or not, is zero. Ultimately, a simulation is conducted to validate the effectiveness of the designed stealth attack signal.