MY new Alpine HD-Radio goes in and out of an analog signal and never really stays true to the HD. I called Alpine and told them everythign is in an 05 Mazda. They asked me if it had a roof mount Antenna and said that the Blue wire from the HD unit has to be connected to the blue wire in the wire harness (radio harness) if thee is a lue wire in the harness, because the roof mount antenna needs to be energized? WTF does that mean, are roof mount antennas energized?