Your VIN is early enough that the power antenna was likely added later.

The most common hookup (to my knowledge) for the antenna (red) power wire is to the permanently live power door lock wiring (brown, on one side of the circuit breaker). I just reconnected my power antenna, and did just that.

Are there any wires you see that just go nowhere? Can you trace any "red" wires from the left side of the car over to the right? Where do they go?