It has been down since last Saturday. I was watching when it got taken down. Looks like they use an emergency broadcast test signal to track down who the seeders are.
The test signal came on and immediately afterwards, the station was deactivated.
From what I understand, the test signal can be sent to only to specified users. Its a trial and error process so it could take a while to find the seed.
Since SyFy was added, its down more often than its up. I guess NBC doesn't like people watching there channel for free.