"Roy Lewallen" wrote
Walt's article was really the first one I ever saw that explained the
phenomenon of currents on the inside and outside of the coax -- my
article is really just an extension of his work.

Roy Lewallen, W7EL

Roy,
Although no credit is given or author claimed, the Radio Works Product
Manual includes a similar drawing and detailed explanation of same. This has
been in print every year for at least the 6 years that I have been buying
products from them. It is the basis for their design, production and
marketing of the current-type baluns. Radio Works also recommends a line
isolator at the transmitter-end, due to near field coupling of antenna
currents onto the coax shield that a Balun cannot prevent. I have never used
that product but it is popular.

Jack