Hi flymee, no you dont need a box to use RB24 ,just log on and register.
To link, have your box connected, go to Options/Account and where is asks for Radarbox user name and Radarbox password use the ones on the Radarbox start up which are on your CD sleeve.
Then press link Radarbox and away you go, or it should.
You dont however need the box connected to access RB24. You dont even need a box.
Alan