A circular polarized wave reception antenna has a monopole antenna having a pole
portion and an ground plate for grounding one terminal of the pole portion and
a polarization converting arrangement disposed around the monopole antenna. The
polarization converting arrangement has a plurality of helical leads extending
in a helical fashion along the pole portion with apart from the pole portion by
a predetermined distance. Each of the helical leads has an end grounded in said
ground plate. The helical leads are disposed at equal angular spaces around the
pole portion. When a resonance wavelength is equal to 128.3 mm, the predetermined
space is equal to 20 mm. Each helical lead has a length of /4. A pitch angle
included between the ground plate and each helical lead is equal to 40 degrees.
