This has been generating some online discussion – a video of a dude hijacking billboards in Times Square using an iPhone 4, a transmitter, a balloon and some tape, like a geeky MacGyver. The feeling at the moment is that this is a publicity stunt, but if so it’s an awesome-looking stunt.

Says YouTube uploader, BitCrash44:

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.

The authenticity of the thing is understandably being a little torn apart.