The WI-51-UBR-10H is a precision-engineered K-Band H-Plane Sectoral Horn Antenna professionally designed and manufactured by Fei Teng Wireless Technology Co., Ltd. (FT-RF) for specialized wide-vertical illumination fields. Operating across the continuous 15 to 22 GHz frequency band, this premium antenna is expertly flared in the H-plane to deliver a distinct, highly predictable Fan-Beam radiation pattern profile (16° H-plane x 100° E-plane) combined with a calibrated nominal gain of 10 dBi. Featuring a Direct Waveguide Input interface with a standardized UBR Style flange mating face, it ensures flawless structural impedance coplanarity and ultra-low-loss power transfer, safely managing continuous wave power loads up to 500 Watts (CW). Precision CNC machined from high-grade structural aluminum alloy in Taiwan, it exhibits exceptional electromechanical longevity, a lightweight 105 g footprint, and excellent pattern stability metrics combined with an exceptionally low maximum V.S.W.R threshold of 1.3 : 1. It stands as the definitive choice for wide-vertical beam scanning grids, automated antenna characterization ranges, industrial EMI/EMC compliance validation scanning, professional wireless communication research, and mission-critical satellite link verification setups demanding uncompromised performance parameters.