Proper ground is only one of the things your 203 needs at the rear glass. The glass includes several antennae ( AM, FM, Radio Frequency Locking ). Attached to the glass is an antenna amplifier which is held in place with adhesive tape. It's critical that the amplifier ( also called a COMBAR ) maintains good contact with the glass. My guess is that the glass installer didn't properly secure the antenna amp when he swapped it onto the new glass, and it has come un-glued. It's possible to pull the headliner down a bit and look up in there with a mirror to see if that's the case. As for the grounding points, they're attached to the body at the window opening. It's possible that they were damaged when the old glass was cut out. They're also visible using the above mentioned method. Good luck and keep us posted.