Original Thread:
http://forum.tvfool.com/showthread.php?t=14336
Antennas don't fail 'hard' very often... If so, you would likely see an obvious physical defect that would account for the signal loss.
Reception trouble shooting is best started at the antenna... This test,
http://forum.tvfool.com/showthread.php?t=13646 is a great place to start, even if you aren't concerned about the question of needing a preamp, the test answers the question of whether the antenna is producing a usable signal.
Two ideas to consider...
Weather may be impacting reception temporarily. Your somewhat weak signal conditions would be more prone to atmospheric conditions impacting them.
The TV tuner may have had it's setup/configuration corrupted... A double rescan may correct that.
http://www.soundandvision.com/conten...-double-rescan