The WI-187-UDR-10H is a laboratory-grade microwave Sectoral Horn Antenna professionally engineered by Fei Teng Wireless Technology Co., Ltd. (FT-RF) for specialized radiation pattern shaping, sector-based signal capture, and anechoic calibration routines across the 3.95 GHz to 5.85 GHz C-Band spectrum. By flaring specifically within the horizontal H-plane mechanical boundaries, this premium sectoral instrument enforces an asymmetrical illumination profile, delivering an expansive 110° vertical spatial coverage swath while simultaneously preserving a tightly focused 12° horizontal beamwidth aperture matrix. Precision CNC machined from premium high-grade materials in Taiwan, the radiator maintains a calibrated directive gain profile of 10 dBi to provide absolute spatial tracking constancy. Featuring an integrated square UDR Flange format for direct, low-loss interconnect mating, this robust 1.0 kg structural component completely eliminates mode breakdown anomalies, rendering it the definitive choice for wide-angle chamber evaluation, radar calibration benchmarking, automated spectrum monitoring networks, and mission-critical Signal Security operations where extreme spatial parameters are required.