there is provided an antenna small in its size but capable of achieving sufficient gain . the antenna comprises antenna elements connected to a power source . the antenna elements comprise upstanding vertical sections connected to the power source and horizontal sections substantially parallel with a ground pattern and having one end thereof connected to an end portion of the vertical sections . the antenna elements further comprise short stubs provided away from the vertical sections toward the other end of the horizontal sections and connected to the ground pattern , and open - ended open stubs provided away from the short stubs toward the other end of the horizontal sections and extending from the horizontal sections toward the ground pattern . the antenna elements are made of a metal foil and are provided on an antenna board .