Richard Harrison wrote:
Due to energy escape in an antenna, incident and reflected energy can
"see" differing impedances on either end of a loading coil. The coil
doesn`t enjoy the type of enforced balanced feed imposed by a balanced
transmission. The feed at its ends is asymmetrical.

If two series coils are installed in a balanced feedline with reflections,
the net currents through the coils will also change from end to end.
--
73, Cecil, W5DXP