Log-periodic antenna

A self-similar log-periodic antenna is described comprising a plurality of substantially triangular conductive elements, symmetrically disposed in either planar or curved configurations about a central conductive boom to form an antenna arm. Two or more antenna arms are assembled into an antenna by symmetrically locating such antenna arms substantially in the shape of a pyramid (for planar arms) or in a conical shape (for curved arms). Some embodiments include a conductive fin, to reduce cross-polarization coupling between antenna arms. Some embodiments include a grounded conductive shield on the interior of the antenna providing electromagnetic shielding for the interior region of the antenna while preserving the self-similar geometry of the antenna and shield combination.