Hi, I have an aftermarket stereo installed in my 97 VW Jetta. It was installed by the previous owner. The radio doesn't work so I took out the stereo and saw that the antenna wasn't plugged in. I was looking for the antenna wire put could not figure out which one it was. I tried looking for the one that looks like a big headphone jack put it wasn't there. Any ideas? Oh the stereo is a Pioneer DEH 3100UB.