I use the apple airport express on all our digital desks. You need to change the IP address of the GLD (vs changing the IP address of the router). 10.0.1.x, subnet mask: 255.255.255.0, if I remember right.
Just a recommendation, the airport express also offers a great feature called airplay (when paired with an apple device). This means you can stream playback music wirelessly from a apple mobile device or laptop straight to your GLD. A very useful feature when mixing from an ipad.
I have experienced dropped signal at a range of 120ft (non-obstructed).
Hope you find something that works!