It appears that you don't need the loop antenna with this unit, unless you
want to use it in the ADF mode. With a long wire hooked up to the external
antenna input, there is no sign of IMD, or any images. I saw two crystals on
the main board, so it may be a dual conversion unit.................I am not
sure yet. I e-mailed David Searle to find out a bit more info. It should
prove interesting.
It is one of the best LW/MW receivers I have seen in a long time.

Pete