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Simonthewizard 
sorry, but he didn’t understand the principle of this antenna, and he tells a lot of technical bullshit…
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It is a coaxial dipole, so a 1/2 lambda.
It works well, I did one for 28 MHZ and one for 14 MHZ.
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… which is of course true for CB-frequencies 26.965 – 27.405 MHz, only (sorry, forgot to mention!).
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In my experience, for a T2LT antenna the below dimensions are ideal in order to obtain a SWR value of 1.3 or even better:
– upper radiator: L = 270 cm
– lower radiator: L = 260 cm
– air coil: 5 turns, D = 11 cm
Source: https://i.ibb.co/NsZdd1p/Bauplan-T2-LT-Antenna-V3.png
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Thanks so much! Your most kind to write
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the tutorial is ok and corresponds to the original publication from the 90s !
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