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Most TV stations these days use a digital STL, which when the signal is dropped or broken up, will exhibit the same behavior as a DTV tuner. Probably due to a tech at the transmitter site doing some maintenance or on-the-spot repairs.
And to think about it - programs are recorded and played back digitally, which are then processed digitally and sent from NYC to their respective NJ uplink sites digitally, the paths from earth to the bird and back down to the regional master controls are digital, from the MC to the local affiliate is digital, the signal from the station to the tx site is digital, and only there is it down converted to analog for NTSC transmission. Not really much 'analog' left in analog TV. (don't confuse these with the HD signals from the nets, those are sent separately in most cases)
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