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| For RTK you have to have a L1/l2 capable GNSS antenna, Usually it is an original Trimble AG25 that is connected with a coaxial cable to the display. This is for "listening" the GNSS (= GPS and GLONASS if unlocked).
Using CORS system to get the RTK accuracy You are getting the RTK corrections over internet in CMR or RTCM format using a so called NTRIP protocol. That can be done with a Trimble modem or a NTRIP client software in a gadget like Android phone running Lefebure NTRIP Client app. From app you have to get them to to display (=GNSS/GPS receiver) to it's serial port (RS232). A serial to bluetooth adapter like Parani Sena SD1000 is the most usual way to it.
Exatcly speaking you need two antennas: a GNSS (=GPS) "globe" and a cell phone antenna. But in most cases cell phone antenna is inside the gadget.
Some external modems do have an external antenna.
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WI CORS to FM-750
