Is it a big hunk of iron? If not, I doubt that it would work.
I read, but have not confirmed, that your best bet is to stop just inside the circle or rectangle of the sensing coil. Supposedly this will work better than the centre of the area.
I read, but have not confirmed, that your best bet is to stop just inside the circle or rectangle of the sensing coil. Supposedly this will work better than the centre of the area.