It didn't work... I did as you said, except I used plastic straws instead of pens, since I'm not strong enough to take them to pieces...
The long part of the antennas are good, but the inside part is a little twisted, I couldn't make them flat. So when I got weird results I thought maybe I was pressing the metal through the straws, and I decided to try with pens. I found some larger ones (these big four colors pens) and I tried again.
It still did nothing. I tried in the basement too. Sometimes they spread, but it was kinda random.
Does that mean I just made it up? Did I trick myself into believing I could feel something when there was naught...?
Or maybe it did whittle away after all... Which would explain why my cat doesn't roll as much now as she did a year back.
I'm a bit disappointed with me... Did I do something wrong? Was I supposed to use a magnet at some point?