Features: * New and high quality * Made of high-quality materials, durable * Full-frequency high-precision external antenna * The external all-band GNSS measurement antenna supports the satellite navigation signal reception of Beidou, GPS and GLONASS systems, meets the current requirements of multi-system compatibility and high-precision measurement, and can be widely used in geodesy, oceanographic measurement and precision agriculture, deformation monitoring and other high-precision navigation and positioning occasions. * The antenna adopts a single-layer multi-feed point ultra-wideband design to minimize the phase center elevation difference of the entire working frequency band. * The antenna unit has high gain and small gain rolling, which has a good reception effect on low-altitude satellite signals and ensures that satellites can still be received normally in some severely blocked situations. * Low-noise amplifiers use pre-filtration technology to effectively suppress out-of-band interference with Nals and improve the reliability of the system. * Passive network path suppression technology effectively reduces the impact of multi-path signals on measurement accuracy. * The waterproof and ultraviolet cover protects the antenna from working on the field for a long time. Specifications: Support satellite signals: BDS: BI, B2. B3: GPS: L1, L2, L5: GLONASS: Gl, G2. G3: Galileo: El, E2, F5a. ESh. F6, L-band Working frequency band: 154MHz-1300MHz: 1551MHz-1615MHz Impedance matching: 50 ohms Polarization method: right-hand circular polarization Antenna shaft ratio: 3dB Horizontal coverage angle: 360 Xiangcentric error: 2.0mm Low-noise amplifier gain: 402dB Noise number: 2.0dB Output standing wave ratio: