Main technical specifications Product Name :RTK gps System Research Antenna, 3G 2G gprs Antenna Enhancement :3dBi Connector :TNC-J Frequency :824-960 MHz, 1710-1880 MHz Applicable to :GPRS CDMA2000 wcdma network Applicable brands and models :SOUTH S86/S82, KOLIDA K9T/A60/K86/K100, TIANYU C93/C96/C98, SANDING T20/T23/T28, RUIDE R90/R93/R98, Hi-Target CHCNAV, GEOMAX, UniStrong (except G10), STONEX (except S10) Pay special attention The difference between radio antennas and network antennas: This link antenna is part of the network antenna and is used for the GNSS rtk receiving host head. Network antennas are used for network accounts (CORS). It is only required when a transportation card is installed on the host head and the host head does not need a network antenna without an installed card. 2. Differences in antenna interfaces: There are mainly two types of interfaces, one is TNC-J and the other is SMA-J. Please pay attention to the interface of the instrument when purchasing.