A power feeding point and a grounded point are located in the vicinity of a
peripheral portion of a glass sheet for a window; the primary antenna
conductor extends in a counterclockwise direction, beginning at the power
feeding point, so that the glass sheet has a substantial center located
inside the primary antenna conductor; two portions of the primary antenna
conductor are connected by a loop-forming conductor to form a loop
conductor by the primary antenna conductor and the loop-forming conductor;
and the grounding conductor is located near to and capacitively coupled
with the primary antenna conductor and the loop-forming conductor.
