The Mk 6 whip antenna was a folding 1.2m long aerial that was used with the Clansman 350, 351 and 352 radio sets. The aerial was made in four parts that were secured together with elastic and could be pulled apart to reduce the size down to under a foot in length:
The aerial has a plastic clip close to the base that catches one of the lengths of aerial to help hold the pieces together and stop them from flopping about:
This allows the aerial to fold into neat package when not being used:
The base of the aerial has a bayonet socket, spring and thumb screw to attach it to the radio:
The aerial is inserted into the radio and twisted anti clockwise before the thumb screw is tightened to prevent it from coming loose by accident:
The aerial has an NSN number printed on the socket as seen above, and also printed onto the lower antenna segment, along with the name of the manufacturer Racal, albeit very faintly on this example:
It is interesting to note the following quote from David Aldea’s Book “5th Infantry Brigade in the Falklands War”:
Generally Clansman stood up well to the rigours of the campaign, although the antenna was prone to snapping in battle as radio operators scuttled from one position to the next.
This aerial adds another piece to my Clansman 350 set that I have recently been building up.
Tales from the Supply Depot 
Please note that a whip (or trailing wire) antenna must not be used with a PRC 352 with the 20 watt amplifier switched on – see warning on page 34 in the User Handbook (search the web for ‘PRC 351 user handbook PDF’). The PRC 352 is for use with remoted antennas only.
These multi section whip antenna were very not robust and the elastic snapped so frequently a repair kit was produced. Eventually a 1.2 metre plastic coated flexible whip (NSN 5985 99 661 6417) was issued as a supplementary item to CES.
Both whip antenna types however used the same bayonet fitting which didn’t stand up to much rough handling, either snapping around the area of the hole for the lug fitting, the lug itself fell out, or the knurled nut became cross threaded.
A radio store could always expect to receive antenna casualties of this type from an exercise or operation
Correction to my reply.
The flexible whip antenna is 0.6 metres, not 1.2 metres, in length
All I remember about this item is that we didn’t use the plastic holder except when we folded the antenna halfway to shorten the height. Otherwise, it’d dangle and flop about annoyingly.
Another thing I remember is dashing into a building, forgetting that I had the antenna at full height: I bounced back out of the door as the antenna flexed against the door’s lintel, springing me back out backwards…