Patent ID: 8223079

Claim:
An antenna device comprising: an antenna comprising an antenna element, a circuit board, and a planar metallic holder disposed between said antenna element and said circuit board, said metallic holder supporting said antenna element on a base; and an antenna case accommodating said antenna, said antenna case comprising a top cover and a bottom plate serving as said base; wherein said metallic holder comprises: a flat-shaped portion mounting a bottom surface of said antenna element; and a plurality of tabs which extend upwards from peripheral edges of said flat-shaped portion, said tabs being provided with a plurality of through holes through which a plurality of screws are respectively penetrable; wherein said plurality of tabs comprises a pair of front tabs disposed forward of said mobile unit and a pair of rear tabs disposed rearward of said mobile unit, and wherein a distance between said pair of front tabs is shorter than a distance between said pair of rear tabs; wherein said bottom plate has a plurality of bosses provided with screw holes which are engageable with the plurality of screws, the plurality of screws being engageable with the plurality of bosses via respective ones of the plurality of through holes of the plurality of tabs; and wherein said antenna device is mounted on a roof of a mobile unit.