If someone has model with build in WiFi/bt card let me know what type of antenna is used and where/how it's placed in the computer. I bought model without card and now I want to upgrade it.

I've bought recently Asus ROG Huracan G21-CX and I have a problem with audio. There is some noise in the front panel (headphones). It doesn't depend on volume. Sometimes it's stronger when I use mouse. I've read about some similar issues and cannot f...