'91 Tarago Radio Antenna Cable Question

[Tarago From Hell]

Hi to everyone,

I have just bought a '91 Tarago. She's a beauty, and I got a good deal on her. However, as is normal for an older vehicle, there are things I need to fix up. One of these things has got me stumped. Here's the gist:

The antenna is broken, so I want to replace it. I have undone the two screws that hold the little bracket with the rubber seal boot on the roof just above the driver's door, and have managed to feed the antenna shaft and cable out of the support pillar where it goes into. I now have the whole antenna shaft and the cable complete with the standard antenna cable male connector on the end. I've modified the antenna so that it will work again, but I am stuck with a problem:

The antenna cable and plug / connector that feeds back down through the support pillar alongside the antenna shaft, where on earth do I have to crawl to to locate that connector and reconnect it with what I presume is an antenna cable extension cable that runs back to the head unit? I have looked under the dash, under the front service compartment, everywhere... but I can't figure out where on earth the cable that feeds through that support pillar from the roof actually comes back out so I can hook it back up.

Any help on this would make you an instant legend !!

Kind Regards,

Marty