Abstract: An antenna for a vehicle including an antenna mast, a mast base and subsurface base that are assembled by means of a fastener that connects the mast base and subsurface base to a body panel of a vehicle. The mast base is a solid member that does not include any openings or conjoint members that could provide a leak path through the mast base. A fastener extends through a hole in the subsurface base and is retained as a subassembly with the subsurface base by means of a retainer clip. The subsurface base includes a coaxial cable receptacle and provides a ground for the coaxial cable shield and conductor for a center conductor. The ground may be provided by a serrated washer and serrations that may be driven into the body panel when the fastener is secured. The center conductor is engaged by the fastener to conduct radio signals from the mast, through the mast base, to the fastener, and to the center conductor of the coaxial cable.