Nowadays as multibeam antennas (MBA) hybrid antennas, spherical reflector antennas and antennas array are widely used. However, their sophisticated construction and considerable size imply some certain difficulties when used with moving vehicles. In the paper, a method of multibeam impedance reflector antenna (MBIA) synthesis is offered. It could be interesting that the reflector form can be arbitrarily conform: e.g. it can be plain, or it can be combined with the vehicle surface. This could open the possibility to construct the MBIA of a smaller size.