I took off the panel underneath the passenger side dash and moved the entire center console up a bit to install new carpet. The car is now back together and now the stock Becker radio isn't working. Sounds just like the antenna is just disconnected. I see what looks like the antenna wire disconnected.(red arrow) But, there isn't an obvious place that it plugs in to. Without ripping everything out again, can anyone tell me where this plugs in to? The one with the RED arrow clearly looks like an antenna cable. Incidentally, what is that thing with the blue arrow?

The red one is for your radio.

The blue one is for a very early version (analog system) mobile phone antenna.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech