A system for configuring antenna systems for selecting directional communication signals corresponding to other apparatuses. A directional communication signal may be selected as the result of a beamforming training operation coordinated between an initiating apparatus and a responder apparatus. Particular modes and/or features may be requested by initiating apparatuses that, for example, may be functionally-limited. The responder may take these requested modes and/or features into account when formulating a beamforming training set for transmission to the initiator.