Denny wrote:
Dunno... Interesting problem...

Not really - a helix can slow down a wave by
a factor of 50 or more. Approximately a foot and
a half of 75m Texas Bugcatcher stock will be self-
resonant at 4 MHz. That's 90 degrees of antenna
stuffed into about a foot and a half of coil.
90 degrees at 4 MHz is 61.5 feet. The VF of that
coil is 1.5/61.5 = 0.024. Actually, pretty simple.
--
73, Cecil http://www.w5dxp.com