The Trimble Zephyr 3 GIS is a dual-frequency GNSS antenna designed for high-accuracy applications. It supports a wide range of GNSS signals, including GPS, GLONASS, Galileo, BeiDou, and SBAS. The antenna features robust low-elevation satellite tracking, sub-millimeter phase center repeatability, and minimization of multipath interference. This makes it suitable for various surveying, mapping, and geospatial projects.