Yes. 

You need the base station harness and a way to power it. Either battery if it's mobile base and tripod deal or constant power if at a building site or bins. Most use a long external antenna to keep the receiver stable and low but have the "transmission point" way up in the air on something that may move around a bit in the wind which is ok. Receiver can't move in the wind. 

But yes, 2 RTK radio receivers with the same radio type is the main components. Either 900 or 450. 450 you need FCC license