An apparatus comprising: an N × M antenna array having N antenna columns (280, 380, 680, 780, 1080, 1180, 1280), each antenna column (280, 380, 680, 780, 1080, 1180, 1280) from the N antenna columns (280, 380, 680, 780, 1080, 1180, 1280) having M antenna elements, where N is a positive integer power of 2 and M is a positive integer; an N x N passive multibeamformer (240, 340, 640, 740, 1040, 1140, 1240) having N antenna ports (242, 342, 742, 1142) and N beam ports (241, 341, 741), where each antenna port (242, 342, 742, 1142) is connected to a respective antenna column (280, 380, 680, 780, 1080, 1180, 1280) of the antenna array; a phase network having N phase shifters, each phase shifter connected to a respective beam port (241, 341, 741) of the passive multibeamformer (240, 340, 640, 740, 1040, 1140, 1240); a switch network (220, 320, 620, 720, 1120, 1220) configured to select one or two of the phase shifters in the phase network; and a controller configured to control the selection of the switch network (220, 320, 620, 720, 1120, 1220) such that: the controller can configure the apparatus to support any one of N main beampatterns of the antenna array by controlling the switch network (220, 320, 620, 720, 1120, 1220) to select a corresponding single phase shifter of the phase network; and the controller can configure the apparatus to support any one of up to at least N -1 combined beampatterns of the antenna array by controlling the switch network (220, 320, 620, 720, 1120, 1220) to select a corresponding pair of phase shifters of the phase network. an N × M antenna array having N antenna columns (280, 380, 680, 780, 1080, 1180, 1280), each antenna column (280, 380, 680, 780, 1080, 1180, 1280) from the N antenna columns (280, 380, 680, 780, 1080, 1180, 1280) having M antenna elements, where N is a positive integer power of 2 and M is a positive integer; an N x N passive multibeamformer (240, 340, 640, 740, 1040, 1140, 1240) having N antenna ports (242, 342, 742, 1142) and N beam ports (241, 341, 741), where each antenna port (242, 342, 742, 1142) is connected to a respective antenna column (280, 380, 680, 780, 1080, 1180, 1280) of the antenna array; a phase network having N phase shifters, each phase shifter connected to a respective beam port (241, 341, 741) of the passive multibeamformer (240, 340, 640, 740, 1040, 1140, 1240); a switch network (220, 320, 620, 720, 1120, 1220) configured to select one or two of the phase shifters in the phase network; and a controller configured to control the selection of the switch network (220, 320, 620, 720, 1120, 1220) such that: the controller can configure the apparatus to support any one of N main beampatterns of the antenna array by controlling the switch network (220, 320, 620, 720, 1120, 1220) to select a corresponding single phase shifter of the phase network; and the controller can configure the apparatus to support any one of up to at least N -1 combined beampatterns of the antenna array by controlling the switch network (220, 320, 620, 720, 1120, 1220) to select a corresponding pair of phase shifters of the phase network. the controller can configure the apparatus to support any one of N main beampatterns of the antenna array by controlling the switch network (220, 320, 620, 720, 1120, 1220) to select a corresponding single phase shifter of the phase network; and the controller can configure the apparatus to support any one of up to at least N -1 combined beampatterns of the antenna array by controlling the switch network (220, 320, 620, 720, 1120, 1220) to select a corresponding pair of phase shifters of the phase network.