Uh, Is that really a question?

"100th annual National Christmas Tree Lighting on CBS: How to watch without cable"

That's the headline is an AL.COM story.

My answer is this photo:

 That's the huge tower on Harrison Road next to the Alabama News Network Studios.

It is used to "broadcast" HD CBS for free to Central Alabama. All you need is an HD antenna attached to your TV....or any digital antenna for the non-HD signal.