John Smith wrote:
"The "major efficiency" you are stating is?"

Q is the usual statement of inductor efficiency.

Libear loading has its advocates. My edition of John Devoldere, ON4UN`s
"Low-Band DXing" is from 1994. On page 9-36 is Fig 9-46, Two-Band (80
and 160-m) vertical system using linear loading to bring the antenna to
resonance on 160 meters.

Best regards, Richard Harrison, KB5WZI