I installed a tv/dvd/cd in-dash unit in my vehicle. while watching tv mode the quality is very static when driving,but when parked the quality is great. I have a window mounted antenna that extends across the front window and a small box to boost the signal.I connected the positive wire from the booster to the accessory wire because I wasn't sure how much it would pull if connected to constant 12v. Is it normal for the tv to show bad or is there something else I can try to get a better tv reception while driving?