Tom Donaly wrote:

Given a 396 meter length of Radio Shack RG58. At 250 kiloherz TLD says
(after some manipulation) that it has a propagation constant of
689.6 X 10^-9 + j7.933 X 10^-3. Zo is 50 -j4.344. Feed it with a

Doesn't that imply that the the matched line loss at 0.25MHz is
689.6E-9*20*e^1*100 dB/100m?

That is 0.0006dB/100m, it seems too good to be true!

Owen