-----------------------------------
HF antenna system
-----------------------------------
This page collects the documentation of an antenna system designed and built in the mid-90s by the group of radio amateurs I was part of. The antenna design was by Ivan, IK2OWX. The system consisted of three antennas: a 4-element yagi for 20 meters, a 6-element yagi for 15 meters and a 6-element yagi for 10 meters. Spacing between antennas was 2.5 meters; the lowest antenna was 11 meters above the ground. For each antenna impedance matching was accomplished via an hairpin match. The antenna system remained operational until the early 2000s and was used to participate in several HF contests.
A photo of the antenna system, as it was in the late nineties
Layout of the 10 m 6 elements yagi antenna (dimensions in meters)
Layout of the 15 m 6 elements yagi antenna (dimensions in meters)
Layout of the 20 m 4 elements yagi antenna (dimensions in meters)
View of the wires as resulting from the nec input files.
Radiation pattern of the 10m 6 elements yagi antenna
(blue=vertical plane/red=horizontal plane)
Radiation pattern of the 15m 6 elements yagi antenna
(blue=vertical plane/red=horizontal plane)
Radiation pattern of the 20m 4 elements yagi antenna
(blue=vertical plane/red=horizontal plane)
Here are the links to the nec input files used to generate the three radiation patterns:
Each of the three files contains the description of the whole system; the only difference is the feeding point.