Quantenna wifi ac chipsets and large metal heat sinks

hi guys

just a question regarding the large metal heat sinks and their effect on the wireless transmission , i have had someone claim that these large metal heat sinks used in the current wireless AC class routers can effect / interfere with the wireless transmission with regards to these new 4 x 4 Quantenna chipsets and that the use of ceramic heat sinks on top of the chips avoids such effect / interference

seeing as you guys have the finger on the pulse whats your take on this as well...

Quantenna wifi ac chipsets and large metal heat sinks