Hal Rosser wrote:
"What effect would it cause if you ran a wire around the perimeter of
the radials - connecting them together."

That would enable and enhance current travel in circles around the
antenna base of no value to the radiated signal but a loss sink for
precious power. Ed Laport in "Radio Antenna Engineering" warns against
this "hysteresis current" product in several places and refers to it as
a "former practice". Ed had the benefit of working with Brown, Lewis,
and Epstein at RCA and used their data liberaly in his book.

Best regards, Richard Harrison, KB5WZI