Why do you think the problem is the WiFi antenna's?
Did you read this: [http://news.softpedia.com/news/How-to-Fix-Flickering-Display-on-MacBook-Pro-Retina-427598.shtml|How to Fix Flickering Display on MacBook Pro Retina].
The issue currently is believed to be a shielding issue of the WiFi card its self and it appears to be a harmonic problem so only a given band and SNR level interferes with the GPU.
You should speak with Apple on any extended warranty for the issue (get your case documented).