A dual antenna system for vehicles, the antenna system comprising first and second radiating elements (1,2) and a substantially flat ground plane in common for the two radiating elements (1,2), wherein the two radiating elements (1,2) are placed above an upper surface of the ground plane, and wherein each radiating element (1,2) is folded such that each radiating element (1,2) has a vertical (1a,2a) and a horizontal surface (1b,2b), wherein the vertical surfaces (1a,2a) of the two radiating elements (1,2) are substantially orthogonal to the ground plane and parallel to each other, wherein the horizontal surfaces (1b,2b) of the two radiating elements (1,2) are substantially coplanar between them and parallel to the ground plane, and wherein the antenna system further comprises two feeding ports (4,5) respectively connected between the vertical surfaces (1a,2a) of the radiating elements (1,2) and the ground plane, and wherein the antenna system further comprises first and second parasitic elements (6,7) connected with the ground plane and substantially coplanar or parallel to the horizontal surfaces (1b,2b) of the radiating elements (1,2), and wherein the first and second parasitic elements (6,7) are placed above the ground plane and extend around respectively the first and second radiating elements (1,2), wherein the ground plane has first and second opposing large edges (3a,3b) and two opposing short edges (3c,3d), wherein the first and a second parasitic elements (6,7) are L-shaped having a short segment and a large segment, and wherein the horizontal surface of the first radiating element is placed between the large segment of the first parasitic element and one of the short edges (3c,3d) of the ground plane, and the horizontal surface of the second radiating element is placed between the large segment of the second parasitic element and the other one of the short edges (3c,3d) of the ground plane. wherein the two radiating elements (1,2) are placed above an upper surface of the ground plane, and wherein each radiating element (1,2) is folded such that each radiating element (1,2) has a vertical (1a,2a) and a horizontal surface (1b,2b), wherein the vertical surfaces (1a,2a) of the two radiating elements (1,2) are substantially orthogonal to the ground plane and parallel to each other, wherein the horizontal surfaces (1b,2b) of the two radiating elements (1,2) are substantially coplanar between them and parallel to the ground plane, and wherein the antenna system further comprises two feeding ports (4,5) respectively connected between the vertical surfaces (1a,2a) of the radiating elements (1,2) and the ground plane, and wherein the antenna system further comprises first and second parasitic elements (6,7) connected with the ground plane and substantially coplanar or parallel to the horizontal surfaces (1b,2b) of the radiating elements (1,2), and wherein the first and second parasitic elements (6,7) are placed above the ground plane and extend around respectively the first and second radiating elements (1,2), wherein the ground plane has first and second opposing large edges (3a,3b) and two opposing short edges (3c,3d), wherein the first and a second parasitic elements (6,7) are L-shaped having a short segment and a large segment, and wherein the horizontal surface of the first radiating element is placed between the large segment of the first parasitic element and one of the short edges (3c,3d) of the ground plane, and the horizontal surface of the second radiating element is placed between the large segment of the second parasitic element and the other one of the short edges (3c,3d) of the ground plane.