The WI-2300-UDR-10 is an industrial-grade, large-scale microwave Standard Gain Horn Antenna professionally engineered by Fei Teng Wireless Technology Co., Ltd. (FT-RF) for high-power directional transmission, antenna calibration, and rigorous laboratory measurements across the continuous 320 MHz to 490 MHz UHF band spectrum. Meticulously optimized to handle extreme thermal and electromechanical strain, this premium radiator delivers a flat nominal directive gain profile of 10 dBi combined with an exceptionally low return reflection loss. Precision manufactured from high-strength 6061 aluminum alloy in Taiwan, the massive horn flare architecture establishes a highly uniform and symmetric radiation footprint, providing equal -3dB beamwidths of 54° in both the H-plane and E-plane matrices. Equipped with a standardized precision-machined UDR Waveguide Flange layout for direct connection without an adapter, this robust 33.8 kg instrument ensures flawless leak-free electromechanical coupling and safely manages continuous wave power loads up to 5000 Watts (CW) with zero boundary degradation. Its waterproof structural enclosure avoids destructive field distortion modes under severe environments, rendering it the definitive choice for international EMI/EMC compliance sweeps, anechoic antenna measurement ranges, broad-area outdoor field tactical operations, and mission-critical high-field infrastructure arrays.