The article investigates the usage of adaptive directed antennas for the Mobile Broadband System (MBS). The advantages and problems are considered. Solutions for the problems are proposed and evaluated with respect to cost, feasibility and efficiency. The MBS is a wireless cellular network operating at 60 GHz. It has been developed in the European collaborative RACE II project R2057, addressing techniques and technology (especially GaAs MMIC, i.e. millimetre-wave monolithic integrated circuits) as well as system concepts. A major feature of MBS is to transparently transport ATM cells over the air interface at bit rates of 34 Mbit/s per carrier.