I was listening to 89.1 WSMR late last night and then this morning from around 7:40 - 8AM, so I guess they must have been off the air between 11pm and 7:40.
Now, if you're referring to the translator on 103.9; I can't vouch for that one way or another, since it's a no show here, even on a car radio, except sometimes if I turn the volume up all the way, I can sometimes hear a very weak signal from 103.9 fade in and out.
(and that's only during the day; at night the 103.9 from the Fort Myers area usually kicks in)
drt,
st. petersburg