I own an amplified charger for my G5 and am not a huge fan of it. The pager doesn’t seem
to pick up very well on 7/800 in the charger. I don’t believe the rear antenna jack is used for 7/800; at least anecdotally it doesn’t seem to matter whether there is an antenna connected or not. Guessing it is only used for the other band (VHF/UHF). I have also wondered if there is something in the amplified charger that produces some interference, but haven’t done any testing to try to figure this out. Even though you moved the pager to different locations, it may still be a signal strength problem. The signal strength indicator isn’t the most precise, either, so that doesn’t help. There is a button you can press to see the actual RSSI value (I can’t remember what it is and I don’t have my pager in front of me, perhaps someone else can chime in); I would suggest bringing that up, stepping away from the pager a few feet to ensure your body isn’t affecting it too much, and noting the RSSI. Then do the same thing with the pager out of the charger and compare.