The HA-0555GA-VF is a high-performance Double Ridged Broadband Waveguide Horn Antenna professionally engineered and manufactured by Fei Teng Wireless Technology Co., Ltd. (FT-RF) for ultra-high frequency microwave and millimeter-wave validation. Operating across a massive frequency spectrum spanning the continuous 5 GHz to 55 GHz range, this laboratory-grade antenna provides stable directional gain profiling from 5 to 12 dB with a highly symmetrical 26° beamwidth profile. Precision-machined with optimized inner double ridges, its physical geometry minimizes boundary reflections and guarantees superior radiation directivity with exceptionally low transmission loss. Equipped with a high-precision 1.85mm V-Female coaxial interface connector, this ultra-lightweight 60g antenna safely handles up to 5 Watts of continuous wave (CW) input power and 30 W peak power. It stands as an essential reference standard for advanced 5G/6G wireless network testing, millimeter-wave radar development, high-frequency anechoic chamber testing, and comprehensive EMC/EMI compliance sweeps requiring ultimate reliability and accurate repeatable radiation patterns.