simonj

Hi,
I have a 2002 ml270.
I have fitted a Comand from an E-class.My understanding was that my car was pre-wired for the gps antenna.
There is a gromet in the roof,beneath that is a threaded hole.Under the roof lining there is a rg58 cable alrady connected.
Behind the radio there are two rg58 cables .One has a phone connector,the other has a connector that is normal for gps.
I purchased a 163 820 15 75 antenna.this appears to be wrong.It has a different connector than is compatable with the one on the roof.It also has three wires coming from it. It looks like the antenna I would need woud have no wires.Is this pre-wiring for a phone antenna?
Which antenna should I purchase?
Is my pre-wiring for gps or phone?
what are the two connectors behind the radio connected to?
Any help would be greatly appreciated.
Best regards
Simon