EFHW Loading Coil Form
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A Simple printable form for building a multi banded End Fed Halfwave Antenna
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- Printables
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- Other Gadgets
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- Creative Commons — Attribution — Noncommercial
To build a multi banded End Fed Halfwave (EFHW) antenna, you often need to add a coil to the wire to help. This is because the ham bands are not exact multiples of each other.
One of my friends, Corey N5YCO took advice given on a stream by K6ARK and came up with a method to build an EFHW that works on 40, 30, 20 and 15 meters. With his permission, I have provided the models based on the dimensions he gave me, including a version that has a small flange to make winding the turns a little easier.
To use this, set the coil about 6 feet away from the 49:1 unun and wind 10 turns using 26 AWG wire. See the drawing in the photos for approximate measurements.
Recommended to print in PETG or ASA since it will be outside.