A multiband radio antenna device (1) for a radio communication terminal, comprising a flat ground substrate (2), and in a plane parallel to said ground substrate a flat parasitic element (7) and a flat antenna element (3). Said antenna element has a longitudinal member (4), a first transverse member (5) extending from a first end portion of said longitudinal member, and a second transverse member (6) extending from a centre portion of said longitudinal member, wherein said parasitic element extends adjacent to an outer portion of and parallel to said second transverse member. A feeding point (8) is disposed at a center portion of said second transverse member. The parasitic element has a first ground connection (9) adjacent to said feeding point, a second ground connection (10) is disposed at an end portion of said second transverse member, and a third ground connection (11) is disposed at a center portion of said first transverse member.