cadillac antenna

i've been reinstalling the original head unit and stripping all the wires from the system that was in my 92 eldo in preperation to sell it. But i can't locate where the antenna wire is to plug in originally? i know it goes somewhere in the lower right side of the wall of computers in the behind the seat/trunk area. but it escapes me help!
anyone that ever put a system, or even just a cd player, in a late model GM luxery car knows what i'm talking about