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RabbitEars.Info
From there you can click on each station, and then click on Technical Data and Screencaps. That opens up a view where you may be able to see their current license and their plans for changes. It isn't really intended for public consumption, so you may have dig around a bit and do some self-teaching to come to understand the information being provided to you.
Also, if you want more detail, you can click on the FCC Query link. That brings you to a page showing all the permits pertaining to that station. There you can see the current operating permits (either for just the digital signal, or if both analog and digital are currently being broadcast, for both the analog and digital signals), as well as construction permits showing what they're planning on moving to.
I don't know which station you were referring to, but perhaps it was WTTK. It is currently operating on Channel 54, with a Contour Range of 26 miles. When they moved to Channel 29, that'll increase to 50 miles. Hmmm... but that already happened. Which station were you talking to?