The WI-1800-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 and calibration routines across the 450 MHz to 630 MHz low-frequency UHF spectrum. Meticulously optimized to handle extreme thermal and electromechanical strain, this premium radiator delivers a flat nominal directive gain profile of 10 dBi paired with exceptional phase center stability and an exceptionally low maximum V.S.W.R threshold of 1.3 : 1. Precision manufactured from high-grade structural aerospace aluminum alloy in Taiwan to satisfy stringent measurement certifications, the massive horn flare architecture establishes a highly uniform and symmetric radiation footprint, providing uniform -3dB beamwidths of 54° in both the H-plane and E-plane matrices. Equipped with a standardized large-scale square UDR Style Flange layout for direct connection without adapters, this robust 17.5 kg component ensures flawless leak-free electromechanical coupling and safely manages continuous wave power loads up to 5000 Watts (CW) with zero boundary degradation. This optimized structural architecture avoids destructive field distortion modes, making it the definitive choice for high-intensity EMI/EMC compliance sweeps, anechoic antenna measurement ranges, professional signal management, and mission-critical Signal Defense high-field infrastructure arrays.