I made my own aluminum side plates, but you can order them direct if you want. Once you've got nice sturdy side panels you can load them up with bulky obnoxious antennas.
Drill a hole and you can bolt these kinds of antenna directly into the side plate. It looks like this:
and when you're done it will look like this:
The antennas tilt out to get out of the way of your hands, and fold down when not in use.
In the end I put the original internal antenna back, and connected one external antenna to the wifi card and the internal antenna is the secondary one. I get around a hundred megs a second this way.