Hello,
I own an OBi110 device and a Rosewill USB External Wireless Adapter (http://www.amazon.com/Rosewill-External-Antenna-Wireless-RNX-N180UBE/dp/B004BV4JXI) that I am looking to connect to my wireless network with. The problem I have encountered is I don't see how to connect these devices to reach my wireless network. For a computer you would have to download drivers but I've seen other devices such as the Western Digital Live streaming devices use this to connect to the device. I was wondering if anyone here would have any insight on making this work.
You cannot connect a USB device to the 110. You need a device with an ethernet connector, like the WD one you mention. Sometimes called a gaming adaptor. Many of the "pocket routers" on ebay can be configured to act as a WiFi client.
eg http://www.ebay.co.uk/itm/Mini-Wireless-N-Pocket-Travel-Router-AP-Client-WiFi-Repeater-150Mbps-Portable-/251603656979.
eg http://www.ebay.co.uk/itm/Mini-Portable-3G-4G-WiFi-Wlan-Hotspot-AP-Client-150Mbps-RJ45-USB-Wireless-Router/191352081057.
(Note that both of the above need a PSU which is not included.)
Depending on the exact situation of your WiFi router and OBi110 such devices with small internal antenna(e) may not give you enough reach. Devices with external antenna(e) usually give more range.