Features: brand new high quality Made of high quality material, Full-band high-precision external antenna. Uses: External full-band GNSS surveying and mapping antenna, supports Beidou, GPS, GLONASS satellite navigation signal reception, meets current multi- compatibility and high-precision measurement requirements, and can be widely used in geodesy, oceanography and other fields of surveying and mapping, precision agriculture, deformation Monitoring and other high-precision navigation and positioning occasions. The antenna adopts a single-layer multi-feed point ultra-wideband design, which minimizes the phase center elevation angle difference in the entire working frequency band 2. The gain of the antenna unit is high, the gain roll-off is small, and the effect of receiving satellite signals at low elevation angles is good, ensuring that satellites can still be received normally in some severe occlusion occasions 3. The low-noise ampl ifier adopts pre-filter technology to effectively suppress out-of-band interference signals and improve reliability 4. Reactive network path suppression technology effectively reduces the of multipath signals on measurement accuracy 5. Waterproof and UV-resistant casing, providing protection for the antenna working in the field for a long time. Product Specifications: Support satellite signals: Beidou: BI, B2. B3: GPS: L1, L2, L5: GLONASS: G1, G2. G3: Galileo: El, E2, F5a. F6, L-band Working frequency band: 154MHz-1300MHz: 1551MHz-1615MHz Impedance matching: 50 ohms Polarization method: right-handed circular polarization Antenna axial ratio:? 3dB Horizontal coverage angle: for 360° Phase center error:? 2.0mm Low noise ampl ifier gain: 40±2dB Noise figure:? 2.0dB Output VSWR. Also, the each additional item means exactly the the same color and size.