Cecil, W5DXP wrote:
"I looked at the ARRL Antenna Cook CD and it contains the same stuff."

Declaring a coil to have zero size and loss does not make it so.

Loss resistance alone does not delay anything. It kills electricity by
converting it to heat instantly. It takes no prisoners. It has no
electrical storage.

Pure inductance delays current by exactly 90-degrees behind the applied
a-c voltage. Resistance adds vectorially with inductive reactance to
produce an impedance on some angle with the resistance between 0 and
90-degrees, depending upon the magnitudes of resistance and reactance.

So, in any coil the current is delayed. Coax with a coiled center
conductor is manufactured as delay line and is specified in microhenries
per foot.

Coils are made of conductors which suffer skin effect resistance. None
escape loss, despite declarations. None occupy zero space.

Assuming perfection is valuable for analysis, but should not be used as
proof of performance.

Best regards, Richard Harrison, KB5WZI