Intel Mini Pci-e adapter, still boggles me

My confusion is that it was some nifty technology that had some kind of built in wireless module inside it. It's like when I look at a laptop I don't see antennas sticking out of them to get wifi. One of those boggling questions I wondered, like why is no one buying these for their pc's to avoid having ugly antenna sticking out from behind their desktops? I thought they where like nano wireless usb adapters, just in pcie form.

http://www.amazon.com/Edimax-EW-7811Un-Wireless-Adapter-Wizard/dp/B003MTTJOY/ref=sr_1_1?ie=UTF8&qid=1381356075&sr=8-1&keywords=nano+usb+wireless

Haha but I'm just silly, thanks though.
 
You don't see the antennae on laptops because they are hidden in the display bezel. With a desktop the antennae must absolutely be outside the case else the signal is greatly attenuated by all the metal in the case (read: no signal beyond a foot or so). The dongle you linked to has poor range compared to a full size antenna.