The WI-284-UAR-10 is a high-power microwave Standard Gain Waveguide Horn Antenna professionally engineered by Fei Teng Wireless Technology Co., Ltd. (FT-RF) for absolute calibration precision, directional transmission sweeps, and high-intensity RF operations across the continuous 2.6 GHz to 3.95 GHz S-Band spectrum. Meticulously optimized to enforce outstanding parameter accuracy and eliminate destructive return loss anomalies, this premium antenna delivers a stable nominal gain profile of 10 dBi paired with a low maximum V.S.W.R profile of 1.3 : 1. Precision CNC machined from high-grade structural aluminum alloy in Taiwan, the advanced launch flare architecture establishes a clean, predictable radiation footprint, providing uniform -3dB beamwidths of 58° in the H-plane and 56° in the E-plane matrices. Equipped with a standardized precision UAR Style Flange interface layout, this lightweight 650 g radiator ensures flawless electromechanical concentricity and low-leakage connection boundaries across standard waveguide test systems. Its robust core safely handles high continuous wave power loads up to 800 Watts (CW) with excellent thermal stability, rendering it the definitive choice for automated antenna gain measurements, international EMI/EMC compliance configurations, mast-mounted outdoor deployments, and mission-critical Signal Defense test benches.