I have AirPort Extreme network card and when I try to use airmong-ng on kali linux in a virtual machine this does not work. I know I need a usb-network card if I wanna make this work but if I boot kali from a cd or usb do i still need this because then I won't be sharing internet with my macbook and it saves 30 bucks. Thanks in advance!
Unfortunately not all WiFi cards / drivers work well on Kali. Especially for monitoring... Please have a look on this link
A common problem in pentest distro such as Kali or BackTrack Linux is when users trying to use a card which is not supported or there just isn’t a supported driver. Most of the following cards are priced below $50USD and they take care of a massive headache and saves time to troubleshoot driver issues rather than investing time to actually do something.
In my case, I had to purchase a TP-Link WN722N as I experienced too many issue with my PCI-E WiFi