(EN) A dual polarised planar antenna 10 comprising first 12 and second 13 antenna elements having respective orthogonal polarisations, the antenna elements 12, 13 being arranged in a back-to-back configuration and fed directly by respective first and second antenna feeds 15, wherein the dual polarised planar antenna 10 further comprises a parasitic element 14 arranged between the antenna elements 12, 13, such that in-use the antenna feeds 15 are decoupled. The parasitic element may be annular in shape. The antenna elements may be printed circuit board antennas and may also be dipole antennas. The antennas may have orthogonal rotating arms and may also comprise parasitic radiating elements. Each antenna element may comprise a dog-leg feed between which the decoupling parasitic element is arranged. The device may also comprise a main antenna back plate and angled wing plates, with an intermediate plate, and may be part of a base station antenna comprising a plurality of such devices.