Mag loop aerial for the Den

[boater sam]

Came across the article by pure chance, nothing else to read out here. There are years worth of browsing on the site.
Wish we could buy some of the stuff advertised these days, and at those prices. If only we had known........

Is it ferrite, or is it iron loaded clay like coil slugs? Ferrite is a ceramic, fired at high temperature, it could be molded in any shape but how then do you get it into the loop? Is it a mystery or  Ad Hype?