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40m OCF Spiral Dipole


This antenna is an off-center fed spiral dipole for 40 meters, based on KN9B’s spiral dipole
post 13 Dec 2020


Spiral antenna Links

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Petlowany Antenna Experiment
It is essentially a very short dipole with spiral-wound coils at each end

Spiral antenna for RTLSDR
A Vivaldi antenna is wideband and directional and the design works well for frequencies above 800 MHz