The SL-1200-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. Operating continuously across the 1075 MHz to 1375 MHz L-band spectrum, this premium reference instrument is meticulously optimized to satisfy the rigorous CTIA ±0.1 dB pattern symmetry thresholds, ensuring an exceptionally uniform omnidirectional radiation profile essential for chamber ripple test characterization. Manufactured with strict industrial tolerances in Taiwan, its lightweight 220 g structural configuration 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.