1, the use of multi-arm helix technology to the right-round polarization and phase center performance, reduce the impact of measurement errors; 2, the antenna unit using air media, with high gain, gain rolling drop characteristics, the low Elevation satellite signal reception effect is good, to that in some Occlusion of more serious occasions can still be normal to collect stars; 3, three anti-hood, for the antenna long-term work in to provide a . Detail Determines Quality Excellent Quality Not Afraid To Enlarge High Quality Material Enhanced Signal Positioning Accuracy Low Loss Precision Internal Structure, Signal Reception And Transmission Efficiency Higher, Longer Communication Distance,Plug And Play Strong Anti-Interference, Accurate Positioning Color: Black Material: plastic Package Contents: 1 * antenna 1 * base 1 * adapter 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.