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...