The WI-137-UAR-10H is a laboratory-grade microwave H-Plane Sectoral Horn Antenna professionally engineered by Fei Teng Wireless Technology Co., Ltd. (FT-RF) for specialized radiation pattern shaping and calibration routines across the 5.85 GHz to 8.2 GHz C-Band spectrum. By flaring specifically within the horizontal H-plane geometries, this premium sectoral horn enforces an ultra-wide asymmetrical illumination path, delivering an expansive 105° E-plane spatial coverage while simultaneously preserving a tightly focused 15° H-plane beamwidth aperture. Precision CNC machined from high-grade structural aluminum alloy in Taiwan, the radiator maintains a flat nominal directive gain profile of 10 dBi combined with an exceptionally low maximum V.S.W.R threshold of 1.3 : 1. Equipped with a standardized rectangular square UAR Style cover flange layout, this robust 580 g component ensures flawless electromechanical coupling and safely manages continuous wave power loads up to 800 Watts (CW). This optimized structural architecture avoids destructive field distortion modes, rendering it the definitive choice for wide-area electromagnetic susceptibility sweeps, EMI/EMC testing, tactical area protection, radar simulation networks, and mission-critical Signal Defense field installations.