Nearly all of the ENG (electronic news gathering) video is sent via point to point microwave links and unless you're on the exact path would be very difficult to intercept directly. They are often in the 2 GHz range. Due to the movement of the helicoptor, the path is even more difficult to intercept.
It looks like they've converted to "HD" on Chopper 13 so the transmission is most likely digital now as well and multiple channels (main video, main audio, cue audio, etc.) and would be difficult to decode as well.
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