An apparatus includes an antenna array having a plurality of antenna elements. The antenna array includes one or more grouping of the plurality of antenna elements, configured to provide: a first configuration in which the one or more grouping of antenna elements supports at least transmission of a signal according to a first antenna system; and a second configuration in which the one or more grouping of antenna elements supports at least reception of a signal according to a second antenna system. The first antenna system includes a Single Input, Single Output antenna system or Multiple Input, Multiple Output antenna system. The second antenna system includes a Single Input, Single Output antenna system or Multiple Input, Multiple Output antenna system. An array of antenna elements can support different modes of operation, for example, different Multiple Input, Multiple Output modes or Multiple Input, Multiple Output and Single Input, Single Output modes.