Whether or not the tint is ceramic has nothing to do with blocking any kind of radio waves. I have called several places (and no I'm not talking about those ghetto-funk get free tint with 50 sub-woofer purchase places) and they all say the same thing. The ceramic tint blocks more of the sun's rays and rejects up to 86% infra-red light. The non-ceramic tints are not capable of doing this.
Here is the tint my wife is going with and the info on nano-ceramic tint...
http://www.huperoptikusa.com/products_ceramic.cfm
P.S. -
Hüper Optik is also German engineered and this is what they say they all put on the more expensive luxury and high-end sports cars.