Ran across this helpful blog post by John Paul Cook as I was looking for a way to use my wireless network card with Hyper-V machines. http://sqlblog.com/blogs/john_paul_cook/archive/2008/03/23/using-wireless-with-hyper-v.aspx

After creating the network bridge as described in John’s post, add that bridge to the VM’s settings in Server Manager as shown below:

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Once you do that, when you start your Hyper-V VM you’ll be able to connect to the internet using your wireless network.

Within my VM, as shown below, 
- LAN Connection 5 is for the wireless network adapter.
- LAN Connection 4 is for the loopback adapter.
- LAN Connection 3 is for the wired network adapter (which is not plugged in).

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And it works:

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Taken from inside my Hyper-V image. . .