The 21-50-296 is a low height, multi-band, vertically polarized communications antenna particularly suited to latest generation VHF/UHF FM/data link radios and public service radios on helicopters with minimal ground clearance.

Designed as a short, top loaded monopole, excellent performance is achieved throughout the frequency range by use of frequency selective matching and decoupling circuits. Mechanical construction uses a glass reinforced thermoplastic shell with foamed-in-place internal elements. A single TNC female connector is fitted to the aluminium base plate and the antenna is DC grounded for p-static protection.