I have one of Alex's low power small loops. it is about 4 feet in diameter
with a small tuning box at the bottom
Tuning is very sharp. Tune for max noise and you've got it. I checked with
an swr bridge before purchasing, and I could reliably tune to 1.7 or less
quickly. With a very fine touch, I could get to 1.3 or less. Alex was
suitably impressed.
The only thing I have to get now is some sort of stand. It is somewhat
heavy, and a standard camera tripod just barely holds it up.
I have used it on 40 through ten with good results.