I always mount mine on the front windshield int he left hand corner. much easier to run the wires, works just as well, and no need to worry about defrosters.

I hope the cell antenna is a hirschman, they are the best.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon