These antennas comprise an aluminium alloy tubular element of 1 inch diameter spaced off from the aircraft fuselage by three or more supporting masts. They can be installed in grounded (“loop”) or ungrounded configurations and are for use on helicopters and sub-sonic fixed wing aircraft.

Support masts are available in 10 inch (to centre of tube) height and can have clamping or sliding head caps. Also available are switched grounding masts to enable the HF antenna to be switched between grounded loop and open-ended radiator.

In addition, a number of different feed-in mast types are available having either coaxial (HN) or single terminal connectors and clamping masts are available as insulators or conductors for use where grounding of the element is required. In the case of clamping masts, connection to the tube is made via unique split holding clamp fixed by four screws, thus enabling rapid assembly and disassembly of the array. It is possible to connect 2 or more tubular elements by use of 21-10-425 clamping joints.

Element tubes, which can be fitted with metal end plugs, are available in lengths from 4 feet to 15 feet and can also be custom bent for specific applications.