A Series, LWB has a nice wee plastic cover thing near the roof edge above the rear pillar on each side. Access to the studs and nuts holding it in place can be gained by removing the trim underneath it and easing the roof lining to one side.
Makes a reasonable place for mounting an antenna, if replaced with a small metal adaptable box it would also make a reasonable place to bring all sorts of leccy stuff to the roof area.
For what it's worth I've fitted the CB Antenna on Truck there and have in the past been able to 'talk' to a couple of users based in Swindon who were using base stations while I was sat on a hill just outside of Brize Norton with a simple short whip antenna on.
This posting may have been helpfull, on the other hand probably not... Either way, I may have had drink when posting it in which case it's probably not as helpfull as it could have been
Work safe, and remember all technical problems can be resolved with a hammer, the trick is knowing where to hit it and how big a hammer to use (I often find it may also help to have a spare bit in the shed to replace the bit you have just mullered

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