Small antenna apparatus for vehicle and manufacturing method thereof

An antenna device for a vehicle, comprising:

• an antenna coil arranged in a helical antenna shape having a substantially constant pitch interval;
• a connector disposed on a first end of the antenna coil;
• a cylinder member disposed on a second end of the antenna coil and electrically connected to the antenna coil;
• a first fixing member configured to cover a portion of the connector and the first end of the antenna coil to fix the antenna coil to the connector;
• a second fixing member filled into a hollow portion and a gap within the substantially constant pitch interval of the antenna coil;
• a third fixing member configured to cover the second end of the antenna coil;
• and
• a cover member configured to cover the antenna coil, a portion of the connector, the cylinder member, the first fixing member, the second fixing member and the third fixing member,
• wherein the first fixing member, the second fixing member and the third fixing member are integrally formed.