Bruce.
Any chance they might be exactly 1 metre long sections?
There was an American sectional whip which was normally 3 metres total length, but could be stretched to 5 metres by adding two extra base sections. I think the individual sections had numbers MS-116, -117 and -118 assigned to them, but I don’t know if that was smallest to largest, or the other way around. It would fit a variety of US made military radio systems and used a course thread connection system between the three sections.
David
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