I've heard that term but wasn't sure what kind of wire and where to attach it!
Here's what I got from a Google search
no idea what this is
an "egg antenna insulator"
I found this Youtube vid of someone testing a kiwi egg for wiggling.
I've been using this method for a week or two. It's very sensitive! Our house is on a road with heavy traffic and the pencil will move when a big truck goes by. I also got a strong reading when my husband was sitting...