I'm about to depart on a round-the-world trip in which I'll be staying in backpacker hostels at least sometimes. I've read about WiFi extenders (usually antennas) that you can hook up to your Mac to boost a weak wireless signal usually these are signals that are barely close enough to register without the extender antenna. Will the Airport Express do this as well? If I buy the Airport Express, can I plug it in inside a hotel room and pick up an otherwise weak wireless signal at a higher speed? Or would that require me to leave the Airport Express next to the actual modem and plug in with an ethernet cable? I'm confused about its functionality. Basically, I want something that can boost a weak WiFi signal, and I'm wondering if the Airport Express is it.