How about a car battery, adapter and a laptop. I thought about just taking a whole car with a laptop in the trunk and a disconnected 12v battery to run it and just leaving it set someplace.....'course, that was when I though WEP could be cracked in a an afternoon of normal network traffic. Now that I hear you need a week of listening to audio 24x7, that makes it a little more difficult....that car sitting by a nearby road would probably have bottles through it's windows by then.