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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
post 30 May 2026
Coils Traps Antennas Links →
Low Cost Antenna Traps
Let's work through the design of a simple-to-construct low-cost antenna trap
La Trampa Balun
The choke balun has represented a more effective solution, from the electrical point of view, for monoband antennas
Multiband vertical
10 meters of vertical that makes for a handy 1/4 wave for 40m, 30m, 20m, 17m
RF Inductance Calculator
Mean diameter of the air core coil, measured from conductor centre to conductor centre include the wire insulation thickness, if any
Repairing Unadilla W2VS 40m Antenna Traps
The Unadilla trap is constructed with two concentric lengths of aluminum tubing separated by an insulating layer, thereby forming the parallel capacitor
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Let's work through the design of a simple-to-construct low-cost antenna trap
The choke balun has represented a more effective solution, from the electrical point of view, for monoband antennas
10 meters of vertical that makes for a handy 1/4 wave for 40m, 30m, 20m, 17m
Mean diameter of the air core coil, measured from conductor centre to conductor centre include the wire insulation thickness, if any
The Unadilla trap is constructed with two concentric lengths of aluminum tubing separated by an insulating layer, thereby forming the parallel capacitor
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