Hi i recently purchased a usb 3.0 usb hub from startech because my vizio ultrabook only had 2 usb ports and i needed more. Everytime i connect the usb hub to my laptop, my WIRELESS strength goes down by 2/3 bars and sometimes even disconnects. I thought i was crazy at first but i tried several times, and without doubt the internet strength is much better without the hub connected. I have an external hardrive connected to the hub, as well as a keyboard. Im thinking it might be the hub taking too much power from my ultrabook forcing it to run on lower settings, but my hub has its own power from an ac adapter. Heres the exact laptop i have

http://www.target.com/p/vizio-14-laptop-pc-ct14-a4-with-128gb-ssd-4gb-memory-silver/-/A-14303810#prodSlot=medium_1_1

Anyone know whats going on? Try moving the wires and see if the signal varies.
You are not crazy. It is well known that USB 3.0 devices, cables and ports emit a lot of interference in the 2.4 GHz and 5 GHz bands. This can kill or severely affect wireless reception, and also Bluetooth. You do not want a USB 3.0 device or connector within 2 metres of a wireless antenna. Since you cannot rebuild your ultrabook with better shielding on the USB ports, and probably cannot easily shield your hard drive and keyboard, your options seem to be LIMITED. You could try a longer, shielded USB 3.0 cable to get the hub further away from the computer, and possibly go back to USB 2.0 for the keyboard which does not need 3.0 anyway.
I must be lucky, I've had no problem with a 3.0HD sitting right next to the wifi laptop.Yep...lucky indeed. Quote from: Salmon Trout on November 09, 2013, 04:34:10 AM

You are not crazy. It is well known that USB 3.0 devices, cables and ports emit a lot of interference in the 2.4 GHz and 5 GHz bands. ...