Vehicular antenna, vehicular antenna-attached window glass, and antenna system

A vehicle antenna comprising:

• a conductor plate;
• a radiator plate facing the conductor plate;
• a feeding portion located on a same side as the conductor plate with respect to the radiator plate;
• a connection conductor connecting the feeding portion and the radiator plate;
• and
• a first element and a second element arranged away from each other on both sides in a vehicle-width direction of a vehicle with respect to the radiator plate,
• wherein the radiator plate is arranged at an inclination of equal to or less than ±15 degrees with respect to a vertical plane perpendicular to a horizontal plane, and
• wherein a portion of at least one of the first element and the second element overlaps the conductor plate, as viewed from a same side as the radiator plate with respect to the conductor plate.