The SL-900-V2 Series provides a laboratory-standard Collinear Sleeve Dipole solution specifically engineered for high-precision OTA (Over-the-Air) performance validation and anechoic chamber calibration within the UHF/GSM spectrum. Calibrated continuously across the 820 MHz to 980 MHz frequency spectrum, this premium reference radiator delivers an exceptionally round omnidirectional radiation pattern with a circular asymmetry profile of < 0.1 dB to ensure strict compliance with strict CTIA pattern symmetry requirements. Its specialized 1/4 wavelength structural sleeve balun completely isolates the feedpoint from cable-induced surface waves and cross-interference, guaranteeing the absolute Signal Integrity necessary for professional gain references, chamber reflectivity evaluations, and low-gain antenna efficiency characterization. Designed and manufactured in Taiwan, it represents the definitive evaluation standard for high-fidelity wireless test environments.