Antenna (1), for use in a wireless terminal including a ground plane (11) and a metal frame (12) encompassing the ground plane with a gap (13) between the metal frame and the ground plane; wherein said antenna is configured to form a grounding connection (15) between the ground plane and the metal frame for operation in a first frequency range (FR1); and wherein the antenna comprises an open cavity structure (100) for a second frequency range (FR2).