what the f....

So I'm making some changes to my setup. I'm relieving my current router from its duties and retiring it as a mini PC for my desktop setup. And I got my hands on a Dell Optiplex that will become my new router.

Now, firstly, the Optiplex came w/o a wifi antenna. I booted it up into a LinuxMint install USB for the first time and didn't expect much from it, but to my surprise, I got a popup: "There are wifi networks available". At that spot there was also my Fenvi PCI wifi card's antenna of my current (soon-to-be-previous) PC and it was barely seeing any wifi, and there came Optiplex with NO antenna attached to it and it managed to maintain stronger and more stable signal. wtf....

Alright, it's Fenvi, it's chinese -- there's probably not much I should expect from it.

Then I hooked it up right next to my current router with an external USB wifi adapter having 4x6dBi antennas on it, serving as my current wifi AP. Trying out hostapd configs, searching for the right channels,... should I test it? Naah, it still doesn't have an antenna - it won't reach my laptop. Meeh, for shits and giggles! `hostapd -d /etc/hostapd/hostapd_custom.conf`, on my lappy `nmcli d wifi rescan; sleep 5; nmcli d wifi` and... wtf... To my surprise, the AP was there! A thick wall away, no antenna whatsoever, and I still could connect to that Optiplex AP and post this rant!

What magic is this??? I'm now a bit concerned about ordering an antenna for it - I'm worried it could either worsen the signal or make it so strong that it'll fry my brains overnight.