| http://www.w3.org/ns/prov#value | - s, and wherein the perimeter of at least one of the holes is shaped as a polygon with three or more sides, the antenna configuration being chosen from the following set: a monopole antenna, a dipole antenna, an aperture antenna or a slot antenna. 2.- An antenna according to claim 1 characterised in that the radiating element is a conducting or superconducting body, said body including at least one
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