Hey guys, I just posted the same question. Here's a sweet spoiler that I found on Phastekperformance website. Solves a lot of the issues with the antenna
Z/TA Trans Am Rear Spoiler :: 2010-2013 Camaro Convertible
Read more:
http://www.phastekperformance.com/20...#ixzz2kZqLMiEQ