Richard Fry wrote:
A bugcatcher coil is not designed to be an antenna, and radiates only
incidentally.

Maybe you missed what I am saying. Take a 75m bugcatcher
coil and add turns to it until it is self-resonant at
4 MHz. You will have a very inefficient helical antenna.
Radiation from such a helical antenna would be purposeful,
not incidental. Heck, 75m hamsticks are less than 1%
efficient and they still call them "antennas".
--
73, Cecil http://www.w5dxp.com