Patent ID: 7375693

Claim:
An in-vehicle antenna apparatus comprising a sheet of glass serving as a windowpane installed in a vehicle; a radiation conductor disposed on an inner surface of the sheet of glass facing an inside of the vehicle; a sheet-metal base plate having an opening and fixed on the inner surface of the sheet of glass; a circuit substrate whose first surface faces the radiation conductor and is provided with a conductor layer and whose second surface defines a component-holding surface electrically connected with the radiation conductor; and a sheet-metal housing which houses the circuit substrate and is attached to the base plate, the circuit substrate being disposed between the sheet-metal base plate and the sheet-metal housing, wherein a section of the housing proximate the sheet of glass includes an engagement portion that loosely fits in the opening; and stoppers placed on sections of the base plate that are adjacent to the opening, the stoppers abutting on the base plate such that an amount of insertion of the engagement portion with respect to the opening is set within a thickness of the base plate.