While the simplest and most stable way to connect your Slingbox to
your router is by a direct Ethernet connection or, if you router is far
away from your TV, by using a pair of SlingLinks, we know that both of
these solutions are not always practical.
Some wireless routers, like the Apple AirPort Express, have only one
Ethernet port. So, once you've plugged in your DSL or Cable modem, you
have no place to plug in the Slingbox.
There are also some cases where SlingLinks just don't work in some
homes. The reason is usually because of multiple power supplies in the
home or old wiring. But no matter the reason, they don't work and you
need a solution.
While the Apple AirPort Express is a wireless router, it can also be
used as a wireless bridge, connecting wired devices like the Slingbox
to your wireless network. And setup is a snap!
This article walks you through setting up a AirPort Express as a
wireless bridge on your home network. Once you are done here, you
should be able to connect your Slingbox to the AirPort Express with the
provided Ethernet cable.
But enough of this jabber. Let's get to work!
 The first step is to plug your new AirPort Express into a wall outlet near your Slingbox.
If the AirPort Express is already configured for another use, you will need to reset it back to factory settings before you begin. Detailed instructions for how to do this are in the documentation that came with your AirPort Express.
Now launch the AirPort Utility application. If you are on a Mac, chances are this application is already installed. If you are using a Windows PC, you will need to install the software from the CD that came with your AirPort Express.
Once open, the AirPort Utility will look for unconfigured base-stations and present them to you on the left side of the window. It will be named something like "Apple Network 0703d".
You will be warned that you are switching networks. While you are configuring your AirPort Express you will not have access to the Internet.
First, select the option to "Connect to my current wireless network". 
On the next screen, select the option to "Extend the range" of your wireless network. 
Then, select your network. If your network is secure, you will need to enter the password here. 
 Connect an Ethernet cable to the Network port on the back of your Slingbox. Connect the other end to the Ethernet port on the bottom of your AirPort Express.
Once you have hooked your video source up to the Slingbox, plug it into the power outlet. The network light will blink for about 30 seconds. But if your AirPort Express was configured properly, it will stop blinking and remain on once it has established itself on your home network.
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