Can anyone assist with some information on the radio in my E55??

I have a 2003 E55 with the Harmon Kardon sound system. I want to install a TV tuner and wondered if there were any RF or external plugs on the rear of the Command System that I can use to patch into??

Has anyone done a TV conversion as an aftermarket product?? My dealer here in Australia says it would cost around $5k to install the 'Benz system and I really don't want to have to outlay that kind of cash.

Any assistance would be appreciated.

Thanx,

Vern
Gold Coast
Australia