Today, wandering around the grassy knoll behind the Ann Arbor, MI Supercharger, I found a great, fruit bearing apple tree. But in addition (as I alway snoop inside the cages to see what I can learn) I found chargers 1A/B and 2 A/B with small antennae on top. (Yes, it happened! They are there: pictures attached). Nothing on 3 A/B nor 4 A/B. It appears they actually enter the cabinet but it is deceptive as they almost look like they are just attached with magnets! Anyone with a clue. I have only visited 6 or 7 sites and this is a first.