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A directive communications antenna comprising upper and lower plates, each having a leading edge, and a parabolic reflecting cylinder disposed between and axially intersecting the plates so as to form a cavity having a focus line. The cavity is open adjacent the plate leading edges. Upper and lower

A directive communications antenna comprising upper and lower plates, each having a leading edge, and a parabolic reflecting cylinder disposed between and axially intersecting the plates so as to form a cavity having a focus line. The cavity is open adjacent the plate leading edges. Upper and lower lip plates respectively extend along the leading edges of the upper and lower plates with both lip plates projecting upwardly therefrom. A feed assembly comprised of a feed probe and a sub-reflector is positioned within the cavity.

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A directive communications antenna comprising: a substantially parabolic upper plate having a leading edge; a substantially parabolic lower plate having a leading edge; a parabolic reflecting cylinder, having a pair of leading edges, disposed between and axially intersecting said plates so as to for

A directive communications antenna comprising: a substantially parabolic upper plate having a leading edge; a substantially parabolic lower plate having a leading edge; a parabolic reflecting cylinder, having a pair of leading edges, disposed between and axially intersecting said plates so as to form an antenna cavity having a focus line and an antenna focus located on said focus line within said cavity, said upper and lower plate leading edges and said parabolic reflecting cylinder leading edges aligned along a common plane defining a cavity aperture thereat; an upper lip plate extending along said upper plate leading edge and projecting upwardly therefrom at a first predetermined angle with respect to a plane defined by said lower plate; a lower lip plate extending along said lower plate leading edge and projecting upwardly therefrom at a second predetermined angle with respect to said plane; and electromagnetic feed means disposed along said focus line within said cavity, comprising; a. a waveguide feed probe extending through a hole in said lower plate into said cavity at a point along said focus line; and b. a reflector extending upwardly within said cavity from said lower plate, said reflector having a concave face facing said reflecting cylinder centered on said focus line between said probe and said lower plate leading edge at said antenna cavity focus.