The DXZone.com Amateur Radio Internet Guide

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40m loaded dipole

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https://www.dxzone.com/dx34316/-40m-loaded-dipole.html

Antennas/40M/40 meter Dipole Antennas
This is an short dipole for 7 MHz. Total length of this dipole is just 10
meters, 33 feet. Missing lenght is balanced by a coil made of 49 turns of a
40mm diameter pvc pipe. The use of a choke balun is recommended, as always,
to adapt the unbalanced coax cable to the balanced antenna, and to prevent
RF feed back along the coax shield.