I am studying the wiring diagram from my 1997 E420 to install a Nokia handsfree kit (Nokia CARK-91H).
I think I am doing good progress and it appears that the unit will have to be located in the left trunk panel and connected to the 25 pin connector.
Can I use the OE cell phone antenna (M11)in the pannel for the Nokia kit? Or is it obsolete and I need to use a stick on rear window antenna?

The rear window is the location of the *Radio* antenna! If the cell antenna is placed there it can corrupt radio signals.

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I have done a couple of these...What works for me is the universal antenna that sticks to the inside of the window and looks like a small stingray.

When doing this, it is possible to connect to the radio phone input to mute the radio when you have a call coming in. (it looks cool for it to say PHONE toooo..) I think it is a yellow or Yellow/black wire on the back of the radio...

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Donnie Drummonds
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Thank you guys!
Yellow/black is the mute wire according to the diagram. Would you not agree that simply tying in the connector (A35) in the trunk (which is supposed to accept the receiver) would make for the simplest installation. It gives access to switched and unswitched power, connection to the front speakers, radio mute, and the wires to the microphone (altough a microphone must still be connected to those wires). . .
Is the stingray antenna like the one at this link? http://www.powercallsirens.com/antennas.shtml

Sorry to bother you. I sincerely appreciate your help!

I ended up getting a plug and play kit from Bird Automotive at Tessco.com. The plug fit right into the harness in the trunk and makes it a little simpler to connect the handsfree kit. The plug is $25, possibly worth the simpler installation. Thought I'd pass this on to others that may consider the same setup.