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A new type of single-element wideband antenna is proposed that can provide wide bandwidth and consistent polarization over the frequency range for which the antenna is impedance matched. The antenna is composed of two parallel sectorial loop antennas (SLAs) that are connected along an axis of symmetry. The novel ultra-wideband coupled sectorial loop antenna has an 8.5:1 impedance bandwidth. The antenna has consistent radiation parameters over a 4:1 frequency range with excellent polarization purity over the entire 8.5:1 frequency range. Modified versions of this UWB antenna, with reduced metallic surfaces and similar radiation parameters, were also designed, fabricated, and measured. Measurement results indicate that these modifications do not adversely affect the UWB behavior of the antenna.