Hi Fred,
?
If I recall, it was an experiment I tried after reading about *tuned* spiral loops (windings in the same plane) in the early days of radio. My intented use was MW only, and I was seeking a greater amount of wire in the same space, and hoped this would work for a broadband loop also, vs. tuned. Indeed, it never worked as well as my single turn version, although it still had some good nulling ability on MW.
?
Guy
Guy Atkins