Why does my car radio have poor reception?

I recently bought a volvo V40 (W reg) and the car radio has poor intermittent reception sometimes as clear as anything others just nothing. There doesn't seem tot be any pattern. I have unscrewed the ariel and swapped it with my wifes but it doesn't solve the problem and her radio works fine. I've... show more I recently bought a volvo V40 (W reg) and the car radio has poor intermittent reception sometimes as clear as anything others just nothing. There doesn't seem tot be any pattern. I have unscrewed the ariel and swapped it with my wifes but it doesn't solve the problem and her radio works fine. I've checked the back of the radio and the cable is plugged in. The only thing I think it might be is the seal around the base is worn and water might have got in but i've no idea how to replace it and you can't get to it from inside the car. Any suggestions
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