EFHW antenna

thingiverse

End Fed Half Wave antenna is my favorite choice for portable operations. It's a resonant antenna, easy to deploy and free of RF issues (that usually are found on similar random wires setup). Since I operate mostly with low power, around 30W maximum, I always used it without counterpoises and I never experienced issues. The complete kit is designed for 10-20-40 m coverage and can be made with 10.1 m wire + 34uH coil + 1.85m additional wire. The winder include also a second connection for GND if required/preferred. This project is a complete kit designed to be 3d printed easily, and includes: Winder base, designed to seat toroids of 140 size (ID 23 mm, OD 23 mm). In my 10-20-40m version I use a FT-140-43 toroid. Winder cover (4x M3 screws required) Insulator, designed for 23AWG wires commonly used for portable operations. Loading coil support, useful if you need a shortened version able to cover the 40m band. With 23AWG enameled wire it has an inductance of around 34uH and is coupled with an additional wire 1.85m long. Obviously this kit can be used also to build random wires antennas by changing the toroid type and the winding ratio, the GND connection allow use of counterpoises. For examples and tutorials about EFHW winding and details visit section "Articles, videos and links (international)" of my website. Follow me and share your prints on Instagram and Facebook @IU1OPK