PURPOSE: To supply power to an upper antenna part without impairing the axial ratio or the non-directional characteristic of a circularly polarized wave to be transmitted and received by a lower antenna part by connecting the required part of an element and a dielectric base board to the feeding point of a ground surface by penetrating them again.

CONSTITUTION: A strip base board 6 on which a bisecting distributor 11 is formed is arranged on the element 3, and simultaneously, the sheath 7 side of a connector 9 is connected to the central part of the element 3, and in addition, the central conductor 8 of the connector 9 is connected to the distributing point 10 of the bisecting distributor 11, and simultaneously, each output point 12 of the bisecting distributor 11 is connected to each feeding point 15 formed on the ground surface 2 by each wire 14. Accordingly, the circularly polarized wave can be transmitted and received at the good axial ratio and good non- direction similarly to a microstrip antenna used generally. Thus, the power can be supplied to the upper antenna part without impairing the axial ratio or the non-directional characteristic of the circularly polarized wave to be transmitted and received by the lower antenna part.