The HS-028-UBR-25A-KF is a high-precision Ka-band Standard Gain Waveguide Horn Antenna professionally engineered and manufactured by Fei Teng Wireless Technology Co., Ltd. (FT-RF) for advanced millimeter-wave RF measurements and surveillance applications. Operating within the high-frequency spectrum across the continuous 26.5 GHz to 40 GHz band, this premium antenna delivers a highly stable directional nominal gain of 25 dBi with a narrow beam profile. Featuring a standardized WR-28 interface layout with a UBR (UG-599U compatible) flange face paired with a precision stainless steel 2.92mm-Female (K) coaxial interface port, it ensures flawless structural impedance coplanarity and ultra-low-loss power transfer. Safely managing continuous wave power loads up to 250 Watts (CW), this radiator is precision machined from premium aluminum alloy in Taiwan. It exhibits outstanding electromechanical longevity and low reflection metrics paired with a typical V.S.W.R threshold of 1.25 : 1, making it an indispensable instrument for Signal Integrity verification, high-fidelity antenna calibration ranges, industrial EMI/EMC testing, and advanced spectrum surveillance environments requiring directional accuracy.