Hope this helps, I had poor reception until I connected the blue wire from the Avic unit- auto antenna relay control terminal to my antenna booster power control terminal on my car (refer to your vehicle wiring diagram), I have a Mercedes with a rear glass antenna. If you have an in glass antenna, I know you need to do this, otherwise if there is any power from your old antenna, connect it there. Perhaps pull the unit out and experiment/trouble shoot. My unit works flawlessly now, but I've pulled it out approx. 4-5 times fixing small probs, the latest being the RCA connects on the Ipod connect