A method and apparatus for use in gaming activities, such as in a slot machine. Furthermore, a magnetic rubber composition for encoder capable of obtaining sufficient magnetic force required for encoder on a circumference of the molded encoder as well as capable of effectively restraining variation of the level of magnetic force, is provided. The present invention has excellent detection performance by receiving data with full order of diversity, which is multiple of the number of receiving antennas and the number of multipath, without complicated operation such as a decision feed equalizer. The first utilizing device utilizes the first location signal to cause positioning of a first reflective surface to a first default position.