power antenna

I managed to rip the power antenna off with a branch the other day and would like to know how to replace it either with the same type or just a reguler
flexi antenna.
I presume access is via the pass. side wheel cavity, if anyone knows where i can get advice on how to change this it would be much appreciated.
Jay snipped-for-privacy@jsmmodelmakers.freeserve.co.uk
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