The rapid development of railway transportation technology provides significant wireless service demand. To be able to produce good quality wireless services in fast-moving train conditions, innovation technology is needed that can overcome fluctuations in Signal to Noise Ratio (SNR) One of the technologies used to overcome SNR fluctuations is to use reconfigurable antenna pattern method. Directional radiation pattern will produce high gain and increase SNR. An antenna with a directional radiation pattern is needed and can be taken from the fast train. This research develops a method that can configure the radiation pattern on the antenna system to support optimal gain in dealing with SNR fluctuations resulting from the development of high speed trains The radiation pattern can be reconfigured in the form of a multibeam radiation pattern with the ability of the beam switch in accordance with the movement of the rail. Switch beam that is used based on a microcontroller using GPS reference