i have a converter box hooked up in my truck. my kenwood kvt-911 has a 7inch screen with a tv tuner. i have hooked up a standard antenna and amplified antenna, when i am parked, the signal is 87% but as soon as i start driving the signal goes down to 0! is there a way to fix this? my analog signal worked fine while driving. i really want to keep my signal while driving. i cant find an answer anywhere online.