an antenna that includes a first element extending from a connection point , and has a curvature such that a first tip end of the first element extends in a direction toward the connection point . a second element is connected to the connection point , and has a second tip end that extends in a direction away from the connection point , the second tip being disposed within an outer periphery of the first element . a distance between a portion of the first element that is parallel to the second element is greater than λ gx / 100 , where λ gx represents an effective wavelength of a first anti - resonance frequency .