This simple device has meant I can now hear low-powered SW Latin Americans in previously impossible circumstances, and it's returned US MWers to my dials. TheIMTs are designed to work over a wide range of frequencies, the choice of ferrite allowing reception of everything from long-wave right through to the 26mHz STL stations and way beyond. I've sold quite a number of these units in New Zealand and am now offering them world-wide.
Payment is to be by money-order.
If you're interested in buying one, please contact Paul Ormandy and send the money-order to me at 33 Greta Street, Oamaru 8901, New Zealand. It works similarly to those very heavy isolating transformers which protect people using electrical equipment from getting zapped 1. Remove the brown wire from the black terminal - leave dangling or tape up. This option is the least effective because it allows for any noise present in your earth system to be fed back into the aerial. This option negates the isolation aspect of the design.