Loop antenna

Since HF antennas tend to be rather large, I wanted to try a small resonant loop.  After doing some research, I found a few sites that seemed rather detailed.  This one seems about the best.

I constructed mine from 3/8" copper tubing, and it is mounted on a camera tripod base.

It is fed using a gamma match.

The tuning is accomplished by a scavenged broadcast FM tuning capacitor and a homebrew air-variable butterfly capacitor.

The antenna can be tuned on the 20 meter through 10 meter bands.  Here I am using it on 20 meters...