To generate a radiation beam, whose vertical and horizontal polarization wave components are almost uniform in every directions by providing a loop antenna and a radiation element, which is branched from the loop antenna and extended therefrom to the system and correcting the directivity of the loop antenna with the radiation element, so as to improve a horizontally polarized wave to have omni-directivity.

A loop antenna 2 for an incoming signal call is placed in parallel on a printed circuit board 1 in figure (a). An antenna 3 is a radiation element to improve the directivity of the loop antenna 2, and is branched from the loop antenna 2 and extended in parallel with the printed circuit board 1. The antenna 3 has a directivity in the direction of a notch to be corrected of the notch of a vertically polarized wave beam of the loop antenna 2. Actual arrangement of the components is as shown in figure (b), that is, they are arranged in the order of the printed circuit board 1, the loop antenna 2, a radio section 5, and a battery 4 from the lower part.