Yannis is also sending me some of his 222-Connect Litz, to try, which is very similar in construction to the 223.5-Connect-Litz.

The difference is that the former uses larger, 22AWG conductors, and the assembly contains two hollow teflon air-tubes, twisted along with the Litz conductors (in order to add space with air dielectic and keep the capacitance low).

Details here: http://www.back-promo.co.uk/html/222connect-litz.html

It'll be interesting finding out if those can raise the bar even further.....!

Marco.