2003 Malibu antenna connection question

i've seen in some posts about other vehicles that there is two connections for the antenna , one into the back of the unit and another one usually located in behind the kick panel up front or in the rear.

Does anyone here know if the Malibu has a second connection anywhere other than the headunit??

The reason i'm asking is that i want to install a rf modulator for my Xm radio and it would be easier to get at a secondary connection than the radio's just in case the sound produced isn't any better with this connection than i can remove it easier than removing the radio all the time.

Thanks all
Gord