A broadband antenna comprising: a conductive plate, said plate comprising four slots (30a, 30b, 30c, 30d) arranged in a rotationally symmetric manner in said plate, each slot of the said four slots extending from a circumference of said plate towards a rotational symmetry center of the plate; four guiding means (70a, 70b, 70c, 70d), each guiding means connected to the plate at one feeding termination point (50a, 50b, 50c, 50d) associated with one slot of the four slots; a first pair of the feeding termination points associated with a first pair of oppositely arranged slots of the said four slots; a second pair of the feeding termination points associated with a second pair of oppositely arranged slots of the said slots; and the feeding termination points being arranged on a same surface of the plate such that: a first feeding termination point of each said pair of feeding termination points is offset from its associated slot in a first circumferential direction; and a second feeding termination point of each said pair of feeding termination points is offset from its associated slot in a circumferential direction that is opposite to the said first circumferential direction; the broadband antenna further comprising: a reflector structure; and a support structure for spacing the conductive plate from the reflector structure, the support structure extending along the rotational symmetry axis of the plate; the broadband antenna further comprising: plastic stand offs arranged remote from the rotational symmetry axis of the plate and supporting the plate; wherein the support structure is formed at least partly by coaxial transmission lines (31, 32). a conductive plate, said plate comprising four slots (30a, 30b, 30c, 30d) arranged in a rotationally symmetric manner in said plate, each slot of the said four slots extending from a circumference of said plate towards a rotational symmetry center of the plate; four guiding means (70a, 70b, 70c, 70d), each guiding means connected to the plate at one feeding termination point (50a, 50b, 50c, 50d) associated with one slot of the four slots; a first pair of the feeding termination points associated with a first pair of oppositely arranged slots of the said four slots; a second pair of the feeding termination points associated with a second pair of oppositely arranged slots of the said slots; and the feeding termination points being arranged on a same surface of the plate such that: a first feeding termination point of each said pair of feeding termination points is offset from its associated slot in a first circumferential direction; and a second feeding termination point of each said pair of feeding termination points is offset from its associated slot in a circumferential direction that is opposite to the said first circumferential direction; the broadband antenna further comprising: a reflector structure; and a support structure for spacing the conductive plate from the reflector structure, the support structure extending along the rotational symmetry axis of the plate; the broadband antenna further comprising: plastic stand offs arranged remote from the rotational symmetry axis of the plate and supporting the plate; wherein the support structure is formed at least partly by coaxial transmission lines (31, 32). a first feeding termination point of each said pair of feeding termination points is offset from its associated slot in a first circumferential direction; and a second feeding termination point of each said pair of feeding termination points is offset from its associated slot in a circumferential direction that is opposite to the said first circumferential direction; the broadband antenna further comprising: a reflector structure; and a support structure for spacing the conductive plate from the reflector structure, the support structure extending along the rotational symmetry axis of the plate; the broadband antenna further comprising: plastic stand offs arranged remote from the rotational symmetry axis of the plate and supporting the plate; wherein the support structure is formed at least partly by coaxial transmission lines (31, 32). a reflector structure; and a support structure for spacing the conductive plate from the reflector structure, the support structure extending along the rotational symmetry axis of the plate; the broadband antenna further comprising: plastic stand offs arranged remote from the rotational symmetry axis of the plate and supporting the plate; wherein the support structure is formed at least partly by coaxial transmission lines (31, 32). plastic stand offs arranged remote from the rotational symmetry axis of the plate and supporting the plate; wherein the support structure is formed at least partly by coaxial transmission lines (31, 32).