The 20-30-29 is a combined Hi-Lo angle UHF Satcom Antenna designed for magnetic mounting on a ferrous military vehicle roof, shelter or housing and on non ferrous platforms via a 4 hole CECOM mounting plate, having four 7/16 inch dia. holes on 4.5 inch circle.

The antenna comprises two co-located elements; a circularly polarized “turnstiled” cross-dipole and a linearly polarized broadband monopole. The two elements have separate RF feeds and by manual selection of either, full hemispheric pattern coverage is provided.

The low angle is intended for elevation angles up to about 45° and the high angle for approximately 45° to zenith.

Construction is from rugged fiberglass, foam-filled for structural integrity and prevention of moisture ingress with aluminum alloy dipole elements and base housing. A powerful magnet sits inside the base housing, which also provides support for the two coaxial connectors.