Cross-eye jamming is a technique used against monopulse radars. Monopulse radars process the left and right received lobes of the target and use the sum and difference of these lobes to track the target. Cross-eye jamming interferes with the difference signal, and it strives to point the radar beam away from the target. Two jammers, usually at the edges of the target wings, receive a pulse from the radar; they send the pulse from one jammer to the other, and then they transmit the pulse back to the radar, with a phase shift of 180 degrees introduced to one of the two signals. The theory of cross-eye jamming was developed in 1958, andthe first cross-eye jammer was established in the late 1970s. However, unmanned aerial vehicles (UAVs) have never been used as transmitters for cross-eye jamming, but they could provide many advantages without the restrictions of distance between them or between the transmitters and the radar. MATLAB software was used to model the jamming environment, and simulations were conducted to investigate the effectiveness of using UAVs.