Patent ID: 7642976

Claim:
An AM/FM receiving antenna, which is provided at a windowpane of a vehicle with a plurality of heat wires constituting a defogger, comprising: an AM antenna element including an end portion as a power supply point and another end portion forming an open end; and an AM/FM antenna element connected to the AM antenna element via the power supply point, wherein the AM antenna element and the AM/FM antenna element are provided at another space of the windowpane except a disposition space of the defogger in such a manner that the AM antenna is located on one side and the AM/FM antenna clement is located on the other side in a vehicle width direction, a distance L between the end portion and the another end portion of the AM antenna element, a reduction ratio α of a material of the windowpane, a minimum wavelength λ min , of a receiving FM frequency band, and a maximum wavelength λ max of the receiving FM frequency band meet a requirement equation of α·λ min /2≦L≦α·λ max /2.