Can Video Screens Be Hacked in Times Square?

A video has appeared on YouTube alleging to show hacking of video screens in Times Square using nothing more than an iPhone and a video transmitter.

According to the blurb for the video:

“the way it works is pretty simple: plug in my transmitter into the iphone 4 and play back any video clip. you can play it through the ipod feature or through the camera roll. the transmitter instantly sends the video signal to the video repeater and the video repeater overrides any video screen that it’s being held next to. it doesn’t matter what shape or size the hacked screen is because the hack video will simply keep its correct dimensions and the rest of the hacked space will stay black.”

There’s some speculation as to whether the hack is real or not, but certainly the tech being used is off the shelf stuff. What do you think?