PURPOSE: To easily exchange an old hatch roof for a new one under simple constitution in the automobile of T-bar roof specification automobile by using a first feeding connector and a second feeding connector as a rod pin for fixing when an antenna hatch roof is fixed to a T-bar roof.

CONSTITUTION: The antenna hatch roof 36 which is exchanged for the hatch roof 26 of the resin detachable hatch roof 22 of the automobile consists of a plane antenna element part 40, a coaxial cable 42, and the connector 38 used as the rod pin for fixing. Furthermore, a coaxial connector which is connected to the connector 38 and which can be used as the rod pin for fixing is provided for the resin detachable hatch roof 22 of the automobile. A feeding and connecting is finished easily only by mounting the antenna hatch roof 36 to the resin detachable hatch roof 22 by permitting the connector 38 and the coaxial connector to share the rod pin.