<< Curiously an earth at the shack end has the opposite effect - so not all earths are the same! >> Good observation. You may want to see an article in the LWCA File Libraries section; specifically,
Hi All, Warning: This is a fairly length E-mail. If you don't have time to read it, please just delete it. Some while back I bought some of the ex-Decca thick plastic covered Litz and wound a 6 foot