Dead air

Still no Channel 51. Now the Fox affiliate is off the air, too, and has been for three-four days. What's going on here? 29/40 was off for a while yesterday afternoon. KFSM has gone dead at least twice in the past year -- during "CSI." I hope KPBI returns before "21" does. Not long ago, before the mass two+-hour power failure Saturday, I had been thinking about how the power goes off more in Little Rock than in Fayetteville. But I've never been anywhere where TV stations simply ceased broadcasting for such extended periods. Don't their licenses come with some sort of "public service" obligations? Don?