On a 2001 E class wagon does the tel-aid antenna go directly to the roof or are there two antennas in the car. the lead seems to go thru a grommet into the wheel well compartment, I would have assumed it would go up to the antenna on the roof of the car, some info says there is a splitter ( not the splitter that is put in line when the cell phone option is in the car) I understand the PSE and that splitter that takes the cell phone signal and the tel-aid signal