A multi-band antenna device intended to be integrated into a metal housing, especially into a multimedia system of an automotive vehicle, including a first, hook-shaped, antenna part linked to a feed intended to be positioned on a printed circuit and to be situated inside the metal housing, a second antenna part having an opening made in a face of the metal housing, the opening exhibiting a hook shape identical to that of the first antenna part, with the same dimensions, and the opening being situated opposite the first antenna part, in a plane parallel to that of said first antenna part, rotated by 90° with respect to said first antenna part.