RHF wrote:

Alternative - Instead of using the Sony AN-1 Active Antenna's
Short Vertical Whip Antenna Element : Use a One Metre
Diameter Horizontal Loop Antenna Element with one-end
of the Loop connected directly to the Sony's Head Unit and
the other-end of the Loop connected via a 300, 450, 600 or
1K Ohm Resister to the Sony's Head Unit. Try the different
Resisters to determine which gives the best Signal Levels
and overall frequency coverage.

This could be an interetsing experiment I've already bought
coppertubing and so to make the loop as described on that previous
page, so if that turns to be a failed experiment, I might use it for
this

Just to clarify (I blame my non-native knowledge of English):

So one end of the loop to the element where the whip is normally
attached to, and the other to the unit with the switches? And, do I
connect the loop to the 'inside' connector of the box? Nothing needs to
be connected to the shielding?

I'd love to see a schematic if possible...