Beamforming techniques, which steer the radiation pattern of an antenna array according to the needs of the communication system, have had a renewed interest in recent years due to their potential application in nest-generation wireless networks. In tbis paper, we present an analog beamforming prototype with automatic phase controL Current literatore in the subject is Umlted to theoretical studies thst assume Ideal RF phase shifters, and do not consider relewnt implementation parameters such as settling time, steady-state error, or system nonlinearities. Our prototype performs a classic PID control over the phase shifters, which are always analyzed in open loop in current literature, providing a novel approach. This prototype is expected to contribute to the implementation of future hybrid beamforming systems (combining digital processing) that bave only been theoretically analyzed so far. In addition, the prototype is a didactic example of the integration nf control systems, communication systems, signal processing, and antenna theory.