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A Co-ax Trap Dipole For 40, 30 and 20 Meters

Having made lots of dipoles, but never a trapped antenna, I started by doing some reading on the subject Coax traps wound on thin plastic formers would be cheap and lightweight
post 27 Sep 2020

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Trapped Dipole Radio Antennas
A trap is a coil and capacitor in parallel having a very high impedance at its resonant frequency

Trapped dipole antennas
Looking at the sketch above, when working 40 m only the red wires are part of the antenna but when using 80 m the red and purple wires are the antenna

Trappola per dipolo 40/80m
Sono stati realizzati due circuiti risonanti di facile riproducibilità e meccanicamente di adeguata robustezza

The W3DZZ antenna for 40 and 80 meter band
Before you start, bee sure that you know exactly where you would hang the dipol