The Horn-reflector antenna was originally conceptualized at Bell Telephone Labs in the early 1940's and developed further by D.C. Hogg at Bell Labs in 1961. It is an adaptation of an offset-fed parabolic reflector or a combination of a square electromagnetic horn and a parabolic reflector - hence Horn reflector. The Horn-reflector is also known as a Hogg horn, Cornucopia or Sugar scoop, due to its characteristic shape.
Due to the shielding effect of the horn, the far side and back lobes are very low. These features, along with high aperture efficiency, make it very suitable for use in satellite communication systems.
Since the 1970's this design has been largely superseded by shrouded parabolic dish antennas (which can achieve similar sidelobe performance with a lighter more compact construction) in commercial communication systems. In many situations - such as at mm-wave frequencies or where mechanical rotation is required - the Hornreflector can provide some distinct advantages over other antenna options....Typical gain pattern of the Horn reflector Typical longitudinal and transverse gain pattern cuts of the antenna