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what year is your Passat? And does the noise only sound when the radio is on? Does turning the lights or the turn signals on change the sound?
have you tried more than one radio? Was it the same part number? is it a beeping sound, or a squeal or whining tone?
is it like a helicopter sound? Try turning the turn signals on and see if it changes at all. If so, then I have replaced the roof mounted antenna and the cable that runs the length of the car, but run them down the left side under the carpet instead of the right side where they are now
Try just unplugging the antenna, and see if it still does it.