So I recently traded in my 06 for an 08 4x4 5.4 60th anniversary edition and I noticed this little antenna thingy on the top of my windshield, could anybody tell me what it might be?

 

I'd say aftermarket remote start.

 

That was my initial thought, tried the key fob all different kinds of ways but got nothing, maybe missing the remote to it? It has a button that appears to turn it on/off, hold it down and a red light comes on

 

I just installed an oem Ford remote start in my wife's 14 Escape and the antenna for it looked almost identical. Same place where I mounted it going by the instructions with one exception, it had me mount it with the body at the top of the glass, antenna stub pointing down.



Her system has a separate fob for operation as shown. The button on your's may be the way you program fobs, I had similar with the oem system except the programming button is attached to the harness near the module inside the dash.
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Yep, AS antennae.

Mine looks similar.