How can I reduce interference from my 2005 Vauxhall Astra's radio?

I'm trying to fit a new stereo into my 2005 Vauxhall Astra. I've connected it all up, using the correct wiring adapters, but I'm having really poor sound quality and lots of interference on my tuner, both on FM and MW. Any suggestions on how to improve this?

Asked on 6 September 2010 by swaff73

Answered by Alan Ross
It may be the tracking on the HT components, static build-up on isolated body panels, a high resistance or open circuit aerial earth, or a suppression device open circuit.
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