Fitted a Columbus yesterday and managed to fix the gps ariel up behind the the unit attached to a piece of metal strucuture which forms part of he dash. My question is it is just stuck there like a magnet which seems pretty firm and I have no problem getting a signal so will this be OK long term?

Also anyone near Godstone in Surrey who could do the coding for the Maxidot?

I think your aerial will be absolutely fine - sounds like you've put it in exactly the same position that I have mine and I've been using it for quite a while now without any probs.