AM FM CB AMC Jeep Radio wiring

AM FM CB AMC Jeep Radio wiring

I’m looking how to wire my new AMC radio for my DJ-6 project.

Here is pictures of it with what I’m thinking how it should connect:

WiringDiagramAMFMCBRadioAMCJeep AMFMCBRadioAMCJeep IMAG1483

I’m sure that the two connectors with white/black/green wires are used for the front/rear speakers. The connectors with the brown/orange/black wires is also easy since it’s written on the nameplate. I would like to be sure for the black connector on the left corner, is it for grounding to the chassis?

I’m wondering if the antenna is OK or not. Should I consider that the radio and the CB are using the same antenna?