The HS-028-UBR-10-NA is a high-precision, calibration-grade Ka-Band Standard Gain Horn Antenna professionally engineered by Fei Teng Wireless Technology Co., Ltd. (FT-RF) for the WR-28 standard waveguide architectures. Operating within the millimeter-wave spectrum across the continuous 26.5 GHz to 40.0 GHz frequency band, this premium antenna delivers a highly consistent and precision-calibrated nominal gain profile of 10 dBi combined with an exceptionally low maximum V.S.W.R threshold of 1.3 : 1. Featuring a Direct Waveguide Input interface with a standardized UG-599/U (UBR Style) flange layout, it ensures optimal structural impedance coplanarity and ultra-low-loss power transfer, safely managing continuous wave power loads up to 500 Watts (CW). Meticulously CNC machined from high-grade aluminum alloy in Taiwan, this ultra-compact component provides remarkably clean and symmetric 54° horizontal and vertical radiation profiles. It stands as the definitive choice for laboratory antenna characterization, specialized 5G evaluation setups, industrial EMI/EMC compliance validation scanning, satellite research grids, and mission-critical high-density frequency scanning arrays demanding uncompromised millimeter-wave performance parameters.