Explanation: Resolvers are the preferred choice for antenna position indication in modern RADARs due to their exceptional accuracy and reliability. These electromechanical transducers provide a continuous, highly precise analog output representing the sine and cosine of the shaft's angular position. This inherent sine/cosine output is ideally suited for digital conversion and processing, allowing sophisticated radar systems to accurately determine target azimuth and elevation with high precision. While synchro transmitters perform a similar function, resolvers offer superior precision and robustness, making them more common in demanding modern applications. Servo systems are the *control mechanism* that *uses* such indicating devices to move the antenna, rather than being the indicator itself. Step motors provide discrete positional control and are generally not used for continuous, high-accuracy angular *sensing* in high-performance radar antennas.