Originally Posted by
SiriusBuzz
I wouldn't doubt it.
Once your turn that key and start the car the interference caused by the increase in power from the alternator can do strange things. Fortunately, it only takes 2 seconds to move the antenna.
With this newly added information you provided about on vs. acc, I would make sure the antenna wire isn't running near any major power lines. You always want to run any kind of antenna and audio input as far from power lines as possible.
What year suburban? Do you hear any wine coming through your speakers when you rev the engine?