An antenna system comprises an antenna module, a controller, and a processor. The antenna module is capable of adopting, at any time, any one of a plurality of polarities. The controller is capable of providing a time-varying control signal to the antenna module. At a specified time, the time-varying control signal directs the antenna module to adopt a specified polarity. The processor obtains, from the antenna module, at least one digital stream in response to an incident radio-frequency (RF) signal impinging on the antenna module. At the specified time, the at least one digital stream corresponds to the antenna module having adopted the specified polarity. The processor analyzes the at least one digital stream from the antenna module, and generates an output signal corresponding to the incident RF signal.