The WI-28-UBR-15 is a high-precision Ka-Band Standard Gain Horn Antenna professionally engineered by Fei Teng Wireless Technology Co., Ltd. (FT-RF) for the WR-28 waveguide standard. Operating across the expansive and continuous millimeter-wave spectrum of 26.5 GHz to 40.0 GHz, this premium antenna delivers a highly stable and precision-calibrated nominal gain profile of 15 dBi combined with an exceptionally low maximum V.S.W.R threshold of 1.3 : 1. Featuring a Direct Waveguide Input equipped with a standardized UG-599/U (UBR Style) flange mating face, it ensures flawless, leak-free electromechanical coupling and ultra-low-loss power transfer for high-energy applications up to 500 Watts (CW). Precision CNC machined from high-grade structural aluminum alloy in Taiwan, the specialized launch geometry delivers exceptionally clean and symmetric 32° radiation pattern profiles across both horizontal and vertical planes. It stands as the definitive choice for millimeter-wave EMI/EMC testing architectures, advanced 5G system parameters validation, high-bandwidth satellite communication development, and mission-critical laboratory anechoic testing environments demanding uncompromised performance parameters.