They are a tuned resonant circuit the same as a box loop. Half of that
resonant circuit is in the radio. Due to differences in the circuitry, there
is hardly a way to just say "take a ferrite rod and wind X number of turns
on it". I could tell you how to do it, including the math necessary, if you
really want to get that deep. If not, and you just want performance, build a
box loop. Lots easier and plans are readily available.


"
You're too far ahead of me RHF. I haven't a clue as to how they work.
All I
wanted to do was just make one 2 times as big as on in a junk radio to see
if I
can get stations better based on size of antenna. At this point, I can't
find a
website that even explains windings etc.