I bought an aftermarket MP3 player for my 95 4Runner. The antenna did work, but not the same as stock radio. The antenna would go up whenever the unit was on, regardless of if I was listening to a CD or the stereo. Also, even though the unit had an auto-dimming feature it didnt sense when the car's lights went on. The install was done by circuit city and I read in the manual that the lights were a common issue and wouldnt work with all cars....the antenna...I dunno.