There are a handful of companies that make spoilers that you can relocate the AM/FM antennae into. I got a Phastek Performance ZTA spoiler that is going on mine next week. MPD1 also makes one. I think the GM Dovetail will work as well. SLP had a nice one but it was recently discontinued. If you want one that the antennae can't be relocated into, you can relocate it inside the tail light panel. Here is the DIY for that.
http://www.camaro5.com/forums/showthread.php?t=272540
ZTA
http://www.phastekperformance.com/20...#ixzz2kZqLMiEQ
Just do a google search from the search button above on any of the ones I mentioned. There are some good pics.