The radios in VW cars (1998 model and onwards) use an amplified aerial for improved radio reception. This amplifier is built into the base of the aerial and is powered by a feed from the stereo. This power feed is sent down the center of the aerial cable.
Therefore, if the factory-fitted stereo is replaced with an aftermarket unit, the aerial will no longer get this power feed and the amplifier in the aerial will not be turned on. This will result in poor radio reception.
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