As of last summer lowband was still active on the east side of the state. I haven't heard anything from the WY line to North Platte, and this winter I didn't hear anything around Omaha. There does seem to be a gap of TRS coverage between North Platte and Lincoln, but I am no way out that way often enough to confirm or deny.
I suspect that the north central and south central part of the state may still have lowband based on previous testing...so it wouldn't hurt to put both in "just in case" unless someone can state with certainity. The new patrol cars are still lowband equipped so..