Try one of your local electrical distributors for replacement wire. Common aerial wire was 7X22 stranded bare copper. The aerial itself was was called "wire, electric, R.4 Mk I" and the lead in was "wire, electric, single, No. 12" The various antenna lengths were 70', 90', 110', 150' 185' & 250'. The lead in was always 10'3". This insulated wire was soldered to one end of the aerial creating what is called an end-fed aerial.
The cylinder plugged into the fitting at the back of the variometer that normally held the rod aerials.
There were rubber insulated wires with C clips that attached to the insulator base when using the vertical mast as an aerial.
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