I found a five page article in the Sept. 1982 QST by VE2CV and W1FB,
titled "The Half-Delta Loop: A Critical Analysis and Practical
Deployment." It is just what I was looking for -- a real analysis
with formulas, charts, graphs, and diagrams. Well, I just got a
couple hundred feet of antenna wire and some insulators. All I need
is some lousy weather to put this thing up!