The SL-2100 Series is a laboratory-standard Precision Sleeve Dipole Reference Antenna professionally engineered by Fei Teng Wireless Technology Co., Ltd. (FT-RF) for high-fidelity Over-the-Air (OTA) performance testing and anechoic chamber calibration routines within the UMTS and LTE frequency bands. Operating continuously across the 1895 MHz to 2195 MHz spectrum, this premium reference instrument is meticulously optimized to satisfy the rigorous CTIA <0.1 dB pattern symmetry thresholds up to 2100 MHz, ensuring an exceptionally uniform omnidirectional radiation profile essential for chamber ripple test characterization. Manufactured with strict industrial tolerances in Taiwan, its high-purity internal copper radiator layout is encased in a premium fiberglass radome. The 140 g coaxial geometry integrates an internal quarter-wavelength sleeve balun that aggressively decouples the antenna structure from feed-cable radiation paths, effectively preserving pristine Signal Integrity. Equipped with a standard premium SMA-Female port (with custom N-Female configurations available upon request), this reference-grade radiator stands as the definitive choice for anechoic reflectivity evaluation, professional wireless efficiency benchmarking, and traceable gain reference calibration within high-frequency tactical and commercial test networks.