sniffing

Hello guys, I am able to sniff the wifi packets using kismet tool in linux and have no problem in that. But what I want is to detect the wifi devices within a specified range(say a 100sq.ft) or within a room. How can I do that?

I bought a rx 480 so i had to use hdmi. And my monitor is Samsung SA350. My monitor stay dark till password screen, so i can't look at bios. Don't know why but it acts like that since i am using hdmi. I only used vga since last month. Now i am using hdmi and encounter with this problem. I play...

I've been looking to buy a gtx 1060 or maybe an rx 470. but i'm not sure if my cpu is good enough. I have an i5-2400 3.10ghz. I need a new gpu because right now i'm using a 660 ti that i borrowed from a friend since my own gpu died on me a couple of months ago, and my friend kinda wants his 660...