The antenna above has been described by Nadisha, 4S7NR and may be of interest to anyone wishing to get on 80M (3.5MHz) that have limited space available.
L1 is 12 feet. L2 also is 12 feet and the overall length is 48 feet.
The two loading coils are described as 67.83uH and can consist of 104 turns of insulated wire, wound over 3.5 inches. The coil diameter is not stated however. Maybe it will be a case for experimentation here.
According to my figures the supplied specs on a 1 inch core equals 67.1mH. That is as close as I could get to the spec
I tried some various combinations and came up with these figures using TEMCo MW0263 20GA wire with a diameter of .034″. I have not yet constructed the antenna.
Using a 24mm core, 103 turns is a length of 3.502″ = 67.8026780571324uH
Using a 15/16″ core, 104 turns is a length of 3.536″ = 67.3954325649715uH