Vehicle roof antenna with a mounting part for an antenna rod with simultaneous securing of a cover hood

An antenna for mounting on a vehicle roof has a base plate adapted to sit on the roof and a threaded fastener separate from the base plate, extending through the base plate and anchored underneath the base plate in the roof. A cover fitted over the base plate is formed with a throughgoing passage generally aligned with the fastener. The fastener is operable by a tool extending through the passage. An antenna rod screwable into the passage is fixed thereby to the cover. The cover can comprise an inner cover fitted over the base plate and formed with an outwardly open threaded socket and a decorative outer cover fitted over the inner cover around the socket. In this case the antenna rod has an end screwable into the socket and bearing downward on the outer cover to secure the outer cover on the inner cover and base plate.