ok so i was kind of looking for the remote antenna around the rear deck area today and found that yellow thing in the pic below. that's the driver's side and the passenger's side is red in color. could that be it? there's a wire from each of them that goes up the C-pillar and another one that goes somewhere else.

 

That looks like the FM antenna, it has a radio wire coming out of it so its either AM or FM.
As for your remote antenna its under the rear bumper, or under the rear bench seat if your car is a pre-97.
Look up 2Ks4's post about extending antenna range.