An apparatus for wireless communication, comprising: a processing system configured to generate a frame associated with beamforming training, the frame comprising an indication of whether the beamforming training is to be performed using a multiple-input and multiple-output, MIMO, transmission scheme, wherein the frame comprises a beam refinement request field, the beam refinement request field comprising one or more bits, wherein the one or more bits provide the indication of whether the beamforming training is to be performed using the MIMO transmission scheme, and wherein the beam refinement request field comprises one or more other bits providing an indication of whether the MIMO transmission scheme is single-user, SU, or multi-user, MU; a first interface configured to output the frame for transmission; and a second interface configured to obtain an indication of at least one first sector to be used during a multiple sector ID, MID, phase of the beamforming training, wherein the processing system is configured to perform the MID phase of the beamforming training using at least one second sector, wherein the first interface is configured to output for transmission a feedback request during the MID phase of the beamforming training, and wherein: a number of sectors of the at least one first sector are different than a number of sectors of the at least one second sector; or the at least one second sector comprises one or more sectors that are not in the at least one first sector. a processing system configured to generate a frame associated with beamforming training, the frame comprising an indication of whether the beamforming training is to be performed using a multiple-input and multiple-output, MIMO, transmission scheme, wherein the frame comprises a beam refinement request field, the beam refinement request field comprising one or more bits, wherein the one or more bits provide the indication of whether the beamforming training is to be performed using the MIMO transmission scheme, and wherein the beam refinement request field comprises one or more other bits providing an indication of whether the MIMO transmission scheme is single-user, SU, or multi-user, MU; a first interface configured to output the frame for transmission; and a second interface configured to obtain an indication of at least one first sector to be used during a multiple sector ID, MID, phase of the beamforming training, wherein the processing system is configured to perform the MID phase of the beamforming training using at least one second sector, wherein the first interface is configured to output for transmission a feedback request during the MID phase of the beamforming training, and wherein: a number of sectors of the at least one first sector are different than a number of sectors of the at least one second sector; or the at least one second sector comprises one or more sectors that are not in the at least one first sector. a number of sectors of the at least one first sector are different than a number of sectors of the at least one second sector; or the at least one second sector comprises one or more sectors that are not in the at least one first sector. <EOS>