Arrows point to the Antenna and Speaker connections. The RCA connectors were soldered to the Ground Plane of the respective PCBs. The connectors can be soldered to the ground plane of the respective boards, as shown here, or on the bottom plate.
If you are going to use a coax connector for the Antenna connection, mount it on a copper piece, and solder it, with sides, onto the bottom plate. Make sure it is sturdy.
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