There's something really wrong in the world if we can see scenes like this. I wonder if he's checking his email, watching YouTube videos or playing Farmville in Facebook. This other one probably has better Wi-Fi signal than most people:

That photograph was captured by reader Pablo Traverso at the UC Berkeley campus:

The homeless man I photographed has rigged up some speakers to a shopping cart, and seems to have some sort of lighting/solar panel rigged up atop of his cart. I've seen him around town a couple of times, and he's always seems to be doing a laptop DJ routine (all techno music).

It seems to me like a Wi-Fi antenna to me. [Thanks Pablo Traverso for the second image!—Top image from Hardly Normal via Twitter]