Asus X556UQ: Is it possible to install a second antenna?

The device is wrong, as I can’t find it in the list - Its Asus X556UQ.

I am currently looking at replacing my wifi card as it keeps disconnecting me from the internet, even thought I tried many things. I have looked at some PCIE cards online, but most have the ‘MAIN’ and ‘AUX’ plugs, and my laptop only has one antenna, so is there a way I can install a second one to get the best out of the wifi card that can use 2?

Thanks!