The present invention relates to a mobile communication device, comprising a body configured with a switchable magnetic antenna, wherein the switchable magnetic antenna is switchable between an ordinary antenna mode and a magnetic antenna mode. The ??Magnetic antenna?? is installed next to antenna of wireless received- transmitted units or WTRU, it enable antenna to produce director effect in a number of bands by adjusting the distance between appropriate magnetic material and antenna. As a result, it could generate a better pattern in different frequencies and increase its gain and antenna beam solid angle.