Here is a video running a Mojo RTK using the Minnesota CORS/VRS RTK operating on an original Greenstar on an 8420T.  The small twisted green and yellow wires supply the CAN bus of the Deere system with RTK GPS.  All functions of the Greenstar stay the same. 

This track was laid out about a month ago and has been driven 60 plus times since.  It is laid out on oat stubble driving at about a 45 degree northwest to southeast line.  Notice the 1 megawatt wind turbines in the same field causing no problems with GPS or cell coverage.