The 21-50-06-20 is a high performance combined UHF/L-band airborne blade antenna suitable for aircraft operating in excess of Mach 2. It is also ideal for use on aircraft subjected to roughrunway operation where both a protective leading edge strip and the solid aluminum alloy base block protect against debris impact.

Construction is from a one piece fiberglass blade molding intimately bonded into an aluminum alloy base block which houses the matching circuits and provides for very solid attachment to airframe via 8 fixing holes.

Radiating elements are surface deposited silvery epoxy shaped in such a way as to produce minimum VSWR in both UHF and L-band and also to optimize radiation pattern at L-band where the antenna would otherwise be electrically too long.

The antenna assembly is sealed by closed cell foam for reliable operation in world-wide conditions of service.