Device and method for opening and/or for starting a vehicle

The arrangement has a number of antennas (1-5) arranged separately from each other on the motor vehicle, a portable key element for authenticating a user, a control unit (11) for the antennas that can communicate via one or more antennas with the external key element and a multiplex unit via which the control unit can drive the antennas.. An independent claim is also included for the following: (a) a method of opening and/or starting a motor vehicle.