Explanation: RADAR (RAdio Detection And Ranging) systems operate at very high frequencies, predominantly within the microwave spectrum (e.g., gigahertz range). Therefore, RADAR receivers are specifically engineered to detect, amplify, and process these high-frequency microwave signals. This requires specialized components and design techniques suitable for microwave frequencies, making them fundamentally similar to other microwave receivers. In contrast, FM receivers are defined by a modulation scheme, not primarily a frequency band. HF (High Frequency) receivers operate in the 3-30 MHz range, and T.V. receivers typically operate in the VHF/UHF bands (tens to hundreds of MHz). These frequency ranges are significantly lower than the multi-gigahertz frequencies commonly used in modern RADAR applications.