http://www.ecshylites.com/catalog/it...191/368049.htm
I forgot all about this. I bought the one in the link and installed it a couple months ago. At first I just removed my stock antenna and disconnected the cable going to the stock one. It was a male end, and I connected it with the male end of the hidden antenna using a female/female RCA adapter. However, the adapter was kinda loose so I taped around it...I know, ghetto. It worked, but it seemed like there might have been a little static. Although I have new door speakers too so it could be that, who knows. I also didn't have AM.
Recently I just bought an extension cable for the antenna wire because my stock wire was screwed up on the stereo end anyway. So I ditched the stock wiring and adapter and hooked everything up correctly. Unfortunately I've had the car apart again since then so I haven't tried it to see if anything changed. I'll post up when I do.