In order to understand the Maxwell theory, the electromagnetic wave (EMW) is visualized for new comer with the demonstration experiment. The radiation of a mixed transmission antenna, regarded as a mixture of the small magnetic and electrical dipole antennas, is not the same as that of the ideal magnetic dipole antenna due to the introduction of a gap. The discrepancies of the radiated energy flux density are discussed between the mixed antenna and ideal magnetic dipole antenna according to superposition theorem (ST) of the induced electrical field.