This is a GNSS RTK antenna from Xsens. This antenna works well with the GPS-RTK providing reception of Beidou satellites where other more basic GPS antennas cannot. This antenna supports GPS, GLONASS, Galileo, and BeiDou https://elecena.pl/product/19175908/xsens-gnss-antenna 2021-08-05 https://elecena.pl/product/19175908/xsens-gnss-antenna 2022-04-05