An antenna is a device that is used to convert guided electromagnetic waves into electrical signals and vice versa (i.e. either in transmitting mode or in receiving mode of operation). Mine Antenna Trainer MI-AC21A is a bench-top antenna system design to demonstrate all concepts of an antenna operations. Student can learn easily about various type of antenna operation with their polar plot. This system comes with a motorized antenna unit to record radiation pattern automatically of any antenna mounted on it.