I'm using a ublox F9P as the base and rover. The base station F9P UART1 is connected to the UART on the RPi. If you are using a 'real' base station and not a prototype PCB board, you would probably want to use a serial-to-usb converter. The Pi is running RTKLib server to feed the correction stream from the base station to RTK2go.com. This is the NTRIP castor. Any number of NTRIP clients (rovers) can then use this signal.

This is part of a bigger project of a home built guidance system. The base station part is working great, the rest is working, but still needs some work. Check out https://agopengps.jimdosite.com/