I answered the question in the DE31 thread... quoting myself:

" DE1105 and DE31

At first, I took a wire and connected it to the negative battery
terminal and the clip... it did help remove alot of the excess noise...

but then I couldn't close the battery cover.


I have since purchased a solder mini-plug (a couple of dollars) from
radio shack (they didn't have the non-solder, which I would've
preferred). I take off the cover of the plug and clip the ground clip
from the antenna to the long connector of the plug. I then plug the
jack into the headphone jack, until I feel resistance, so that only the

ground is connected. (No soldering involved). I plan on eventually
snipping the bottom of the plug.


Again, as others have said, make sure that the amp/tuner is on the
correct side of the wire/antenna and fine tune it well. "





Daniel wrote:
wrote:
When using the DE31 with the supplied clips (alligator clips, without
teeth), such as with the DE1105, make sure that you connect the ground
clip as well! You can connect it to the battery ground, or the ground
of the headphone jack. Making the ground connection really lowers the
noise level alot (apparent on some frequencies much more than others)!

I connected the black ground clip of the DE31 to the battery ground of
the DE1105 with a bit of aluminium. It didn't help. What am I doing
wrong?