I once made it, but this antenna requires accuracy (coils are difficult to control), and with my poor skills, I could not make an accurate one, and results were poor. It is likely that someone with good skill has made a good one from that design, but no one has confirmed this.
As it is difficult to make a good performing antenna with coils by a person of average skill, I have created another design myself, which uses a Stub instead of coils. I named it V-Stub as the shape of my Stub was V, rathar than conventional U.
As the V-Stub does not have any coils, it does not require as high degree of accuracy as the coils requirs. It is therefore easy for a person of average skill to make a successful V-Stub.
https://discussions.flightaware.com/t/quick-spider-no-soldering-no-connector/19181/114
Pigtail required to connect RG-6 coax to FA Pro Stick
30 / 50 / 60 cm, F-female to SMA-male pigtail RG316 / RG58 / RG174
