What ardusimple boards do i need for rtk base and rover

Hardware
4

It’s better to buy the kit with the antenna I think.

You save 10$ on the antenna

But first you must know (and tell us) if you want send corrections over Internet(Ntrip) or radio, this will afect the hardware.

You need one kit for the vehicle and one for the base. For radio ArduiSimple also have complete kits.

For Ntrip you can buy their NtripMaster to put over the simpleRTK2B board or use a Raspberry Pi or esp32 board.