The L Band Precision Sleeve Dipole Antenna is a laboratory-standard instrument 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 1400 MHz to 1700 MHz spectrum, this premium reference radiator is meticulously optimized to satisfy the rigorous CTIA pattern symmetry thresholds, ensuring an exceptionally uniform omnidirectional radiation profile with roundness deviations as low as <0.1 dB from 1400 to 1640 MHz. Manufactured with strict industrial tolerances in Taiwan, its high-purity internal copper radiator layout is encased in a premium low-loss fiberglass radome. The 160 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.