I've been planning to re-locate the aerial onto the roof of the Scoob for a while now and change it from a tacky telescopic metal one to a BMW-style 'shark-fin', but you could fit a rally-style mast-aerial, a bee-sting or a GPS-box lookalike in the same way. Its not a difficult job at all, but a brave enough one for me to struggle to get round to it. Doesn't look like it'll be any time soon, with all the other jobs mounting up [power-steering is gonna need looking at first I think], but I reckon its a sound idea so I'll write it up anyway.
Removing the Stock Aerial:
Unclip and remove the plastic cover on the driver's A-pillar inside the car and cut the wires going to the aerial-mount.
Remove the two screws holding the aerial-mount with a flat-head screwdriver and prize the plastic-mount away from the a-pillar.
Bridge the holes in the a-pillar with metal-filler, or just stick about 5 layers of black-tape over the back of them, then fill the outer layer with P38 body-filler. Its only a tiny area so shouldn't be hard to sand, prime and paint-match.
Installing the New Aerial:
Inside the car, unclip and pull down the roof-lining. I'm still unclear on how to do this so, for now, refer to the Body section of the workshop manual here - http://www.scoobylab.co.cc/2010/12/manuals.html.
Find a suitable spot and drill a hole wide enough for the new-aerial's mounting-stud. Drill from the outside in and it's easy to dent the roof so drill slowly, use plenty of oil on the bit and it might be worth starting with a small pilot-hole to make sure the location is accurate.
Place the mounting-stud of the new-aerial through the hole and stick the base down onto the roof. Tighten the nut onto the mounting-stud inside the car.
Extend the cut-off wires at the a-pillar, if necessary, across the inside of the roof to meet the cable on the new-aerial and tape it into place. It's likely the new unit will have a male FM-aerial connector on it [same as the one in the dash that plugs in to the head-unit], so you could cut it off and hard-wire it, but for a nicer job I'd recommend getting a female FM-aerial socket from Halford's for a couple of quid and crimping it to the a-pillar wire. That way the aerial can be un-plugged easily if some idiot decides to nick your new bee-sting and you have to a quick replacement.
Clip the roof-lining back up into place and replace the plastic-cover to the inside of the a-pillar.
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