Does anyone know how the factory ran the Sirius antenna?

I activated the Sirius in a used '07 Vanden Plas but cannot get signal. Sirius says the signal is sent to the radio but on the device in ash tray is says 0 sat and 0 ter signal.

My father thinks the antenna and ALL other wires are ran into a box in the trunk but I had a sirius radio before and had to run it the length of the car. I didnt think you can cut satellite antenna and splice it.

Any info would be helpful.

Thanks