If you're at all handy with tools and curious, you (or a buddy) will soon be experimenting with extending the range of wireless transmissions. I assume from your handle that you have a Titanium Powerbook. If you have an Airport card installed in a TiBook, you know the range sucks and might be curious about what can be done about it. A PCMIA Orinoco card, possibly with a range extender is a practical way to boost your reception. But, heck, that dish can, under the right circumstances and with a little work, extend your range accross town! Though a Pringles can might be more portable!
If you're not interested yet, hold on to it. One of your buddies will be interested.
Use it as a salad bowl, or as a large dish for chips and dip. Use it as a large hat, for when it is really raining out there. You could also use it as the top section of a droid, if you are building one.
Otherwise, put an ad up and see if anyone wants to purchase it from you.