The SL-3600-SF 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 5G NR and CBRS bands. Operating continuously across the 3500 MHz to 3700 MHz frequency spectrum, this premium reference instrument is meticulously optimized to satisfy the rigorous CTIA ±0.1 dB pattern symmetry thresholds, ensuring an exceptionally uniform toroidal radiation profile essential for chamber ripple test characterization. Manufactured with strict industrial tolerances in Taiwan, its lightweight 100 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 coaxial interface port, 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.