There's a lot more to spoofing than the article delved into. For example, there's not any one "GPS signal" but typically several seperate ones. For example, my GPS usually locks onto about a dozen "birds" or satellites at any given time, which means a dozen different signals to spoof. This is, as you might imagine, rather difficult.

If any one signal is so far out of phase with the others that it doesn't even make sense, then that signal will find itself discarded as the GPS unit figures it's a case of multipath (like an echo) or doppler shift (like a radar detector detects speed) causing the error.

Other technologies offer correction to GPS as well, particularly cell phones.

AGPS (Assisted GPS) for example uses not only GPS from the birds, but also triangulation from cell phone towers. After all, the cell phone companies know where the cell towers are, the things aren't moving any, and so by pinging a cell phone (sort of like a sonar ping) a location can be generally had. Even without seeing one single GPS bird, a location will be good to within about a thousand feet.

Skyhook Wireless is another example of GPS-less location. Anybody with a Wi-Fi Touch has probably seen this one in action. Basically, there's a nationwide map of Wi-Fi access points (like cell towers, these don't move much) and the device, looking at what all Wi-Fi access points are available to it, can figure out where on Earth it probably is by comparing known MAC addresses and such. Yes, Big Brother (aka Google) went and mapped a Wi-Fi near you.

Because of this, GPS 'spoofing' would not likely be worth the effort required to achieve the desired chaos and panic. Even more dissuading would be the fact that you'd need to transmit a strong signal on known frequencies. A whole bunch of serious men wanting to talk to you are going to be tracking your equipment down, and they won't need GPS to do it, because you've got to set up a radio beacon leading them to your doorstep.

I know I wouldn't want to try it. The 15 minutes of fame ain't worth the decades in the pokey.