A television tuned to a dead channel looks like the HBO logo... A quick google search said it was still in use as of 2015.
Last television I hooked up using a digital antenna would simply not show anything if the signal didn't exist. If you had poor signal, you'd get more compression artifacts. Nothing there should translate to the white noise image.
Right?
Could they research it and find the answer? Yes. But that is different from just knowing it.
This makes it unlike the stage imagery, which is still accurate.