In an antenna apparatus for a vehicle, the antenna apparatus being provided on
the vehicle in which at least a part of an outside plank panel of the vehicle is
constituted by an outer panel made of a synthetic resin material, the antenna apparatus
has at least one non-earthed type antenna, the non-earthed type antenna is provided
with a first antenna element connected to an inner conductor of a coaxial cable
via a first feeding point, and a second antenna element connected to an outer conductor
of the coaxial cable via a second feeding point, and at least both the first and
second antenna elements and both the first and second feeding points are arranged
in a portion which is inside the outer panel made of the synthetic resin material
and is apart from the earthed conductor on the part of the vehicle body, thereby
it is possible to improve a receiving performance of a radio wave having a short
wavelength, and can restrict an influence of a noise.
