The use of multi arm spiral technology ensures right-handed circular polarization and phase center performance, reducing the impact of measurement errors; The antenna unit has the characteristics of high gain and small gain , which is good for receiving low elevation satellite signals; Exquisite low noise, high gain amplification, and excellent out of band suppression; Small size, light weight, easy to carry and install. Main technical indicators (typical) Patch Architecture:Quadrifilar Helix Supported positioning signal bands GPS: L1/L2/L5 GLONASS: L1/L2/L3 BDS: B1/B2/B3 : E1/E5/E6 L-band Gain x :2.5 dBi Polarization:RHCP Axial Ratio@zenith:1.5dB Azimuth Coverage:360 Impedance:50 ohm LNA Frequency Range:1164MHz~1278MHz/1525MHz~1615MHz LNA Gain x :353.0dB(Typ. @25C) Group Delay Variation:5ns Noise Figure x :1.5 dB@25C , Typ. Output VSWR:1.8:1 typ. 2.0:1max Operation Voltage:3.0~6.0V DC Operation Current:45mA Mechanicals & Environmental Dimension:40.8mm x 40.2mm Connector:SMA-J Operating Temp:-40~+85 Storage Temp:-45~+85 Humidity:95% No-condensing Waterproof:IP67 Colour:As Shown Material:plastic Package Contents: 4 x Multi-frequency Spiral Antenna(Due to different product batches, the appearance , which does not affect the use) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.