The WI-15-UG-15 is a laboratory-grade Millimeter Wave (mmWave) Horn Antenna professionally engineered by Fei Teng Wireless Technology Co., Ltd. (FT-RF) for high-fidelity directional transmission, antenna calibration, and advanced high-frequency diagnostics across the continuous 50.0 GHz to 75.0 GHz V-Band spectrum. Meticulously optimized to enforce exceptional beam symmetry, this premium horn antenna delivers a flat nominal directive gain profile of 15 dBi combined with an exceptionally low maximum V.S.W.R threshold of 1.3 : 1. Precision CNC machined from premium high-precision structural alloys in Taiwan, the advanced millimeter-wave launch architecture establishes a highly stable radiation footprint, providing uniform -3dB beamwidths of 30° in the H-plane and 31° in the E-plane matrix. Equipped with a standardized circular precision UG-385/U Style waveguide flange layout, this ultra-lightweight 10 g instrument ensures flawless electromechanical alignment, eliminates boundary signal leakage, and safely manages continuous wave power loads up to 150 Watts (CW). Its optimized microscopic structural tolerances avoid destructive field distortion modes, rendering it the definitive choice for next-generation 5G/6G wireless research networks, high-bandwidth satellite communication, automated spectrum surveillance matrices, and mission-critical Signal Integrity laboratory verification setups.