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How to remove roof-top aerial of Vauxhall Vectra?

I own a 1999 Vauxhall Vectra 5-door Hatchback 2.5 V6 Automatic.
I need to replace the roof aerial as the plastic base is beginning to split and I am concerned about possible rainwater ingress.
Can anybody let me know how I can remove this fitting. Thanks.
John M, January 2011
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