I don't recommend removing the headliner at all, and the good news is you shouldn't have to. I don't remember exactly how they all come off, but you should be able to remove or pull back the trim all along and just kinda push the antenna cable in under the headliner at the edge. I went down the right side with my XM wires and that's all I did.
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ChuckH
"Every morning when I wake up I know it's not going to get any better 'til I go back to sleep again!" Al Bundy