1. Common Antenna Problems
  2. End Fed Random Wire
  3. Squid Poles
  4. Dipoles-Horizontal - The Trapped Dipole
  5. OCF Dipoles
  6. W3DZZ MULTI-BAND ANTENNA 80-40-20-15-10M
  7. Inverted Vees
  8. Loops
  9. Yagi–Uda Antennas
  10. Beverage Antenna (Receive Only)
  11. Building Yagi Antennas
  12. My Antenna Projects
  13. Professional Antennas
  14. Passive Intermodulation (PIM)
  15. References

Common Antenna Problems


End Fed Random Wire

Random-Wire-Antenna-Lengths (PDF) (local)


Squid Poles

Introducing the squid pole - Phil Storr's home page

VK7JJ Squid Pole Writeup

Haveford HAM Amateur Radio Telescopic Squid Pole - 10 Metres
Image Image
Image Image

eBay item number:281902864023


Dipoles-Horizontal - The Trapped Dipole


OCF Dipoles

OCF Dipole by Ron Bertrand



Antenna Traps for the W3DZZ 7.1 MHz 100 Watts

W3DZZ - a classic dipole heavily modified, now 5 bands & no tuner


Inverted Vees

VK4WST Muti Inverted-V Antenna




VK2JI 40 meter Loop


Yagi–Uda Antennas

A Yagi–Uda antenna, commonly known as a Yagi antenna, is a directional antenna consisting of multiple parallel elements in a line, usually half-wave dipoles made of metal rods. Yagi–Uda antennas consist of a single driven element connected to the transmitter or receiver with a transmission line, and additional "parasitic elements" which are not connected to the transmitter or receiver: a so-called reflector and one or more directors. It was invented in 1926 by Shintaro Uda of Tohoku Imperial University, Japan, and (with a lesser role played by his colleague) Hidetsugu Yagi.

Hidetsugu Yagi holding his famous Yagi-Uda design of radio antenna, which he co-developed with Shintaro Uda in the 1920s at Tohoku Imperial University in Japan.
Hidetsugu Yagi holding his famous Yagi-Uda antenna

Building Yaga Antennas

Yagi Calculator by John Drew - DL6WU style yagis for VHF/UHF (updated 14 July 2015): For general design I use the VK5DJ program. It is based on the research conducted by DL6WU

A Note from the VK5DJ web Site:

This is buried in the Acknowledgements section and can easily be missed.

Yagi Calculator is a program to assist with the design of long yagi antennas. It uses the graphs and principles developed by DL6WU and printed originally in the German Radio Magazine VHF Communications (March 1982). The article was titled Extremely Long Yagi Antennas. For best front to back ratio it is recommended that a yagi be constructed with one of the following numbers of elements - 10,14,19,24. Yagi builders are reminded that DL6WU designs are primarily for long yagis. A boom length of 2 wavelengths (or 10 elements) would be a minimum sized antenna. On the other hand, yagis with as few as 8 elements have used the design and worked very well.

Download the windows program, SetupYagiCalculator.exe from John Drew's site. It runs under wine without any issues on my Ubuntu Version 18.04.
Download SetupYagiCalculator.exe

Folded Dipoles for VHF/UHF Yagis:


Beverage Antenna (Receive Only)


My Antenna Projects

Yagi No1 - 2m 13el Antennas Built February 2018:
As yet still not completed.

Yagi No2 - 70cm 8el Antennas Built March 2019:
70cm 8el Antennas Built March 2019


Professional Antennas

Commercial Antennas


Passive Intermodulation (PIM)


PIM is a form of intermodulation distortion that occurs in components normally thought of as linear, such as cables, connectors and antennas. PIM shows up as a set of unwanted signals created by the mixing of two or more strong RF signals in a nonlinear device, such as a loose or corroded connector, or nearby rust. Other names for PIM include the diode effect and the rusty bolt effect.



Martin Steyer DK7ZB Antenna-Homepage:


Glenn Lyons VK4PK
Ver:gnl20190128 - pre published v0.9