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I don't have the Bentley in any of my online repair manuals and there isn't a lot of info either on the internet, but I did find this article on Radio antenna replacement in a forum, with photos at the bottom of this page, http://www.rollsroyceforums.com/forums/27-sz-motorcars-1980-2003/715-radio-antenna-replacement.html
specifically this photo, https://postimg.org/image/4p7qa63p5/
Then there is this article, http://www.popularmechanics.com/cars/how-to/a7443/4-steps-to-fix-that-pesky-car-radio-antenna/