I responded to your PM but I'm a little better now.
If you take it off there is a bracket underneath there. It's on there pretty good and you'll have to repaint the roof and also plug the 3/4" hole or so in the roof if you take it off. My suggestion would be either figure out why it's squeaking or remove it, repaint the roof. It's just a PIA to me, so I took it off and left the ugly bracket on but no one notices but me. You'll also most likely have to use some sort of sealant IE RTV if you do take it off to keep water from getting in and running down the Apillar onto your GEM module. This happened to me, and made the truck do all kinds of funky things. Once it dried out though I was alright.
hope this helps, any other questions you can PM me