I was in north Lincoln and this was via K18CD. However, KSNB 4.1 and 4.2 is showing up in HDHomeRun logs in Grand Island, Hastings, York, and occasionally Lincoln. It's on, but just very hard to get on RF 4. I don't remember if this was 18.1 or 18.2 but they are identical.
Some perspective on low VHF... using a portable antenna (I have a monopole antenna, and a "Leaf" flat panel) I have had difficulty getting KNOP in downtown North Platte. That's within 3 miles of the transmitter. When KNOP was on channel 22, I got it on a small flat-panel antenna just outside of Ogallala. KHAS, barely even a blip on the signal meter in Kearney, and showing up on the tuner but unwatchable in Grand Island. 60% signal in Giltner, breaking up a lot but at least viewable. That's how hard it is to get VHF-low stations without an attic or rooftop VHF antenna.
Also, KWAZ-LP (analog) is transmitting again, but at just a couple blocks from the transmitter, the best picture I could receive was fuzzy and usually black and white. The signal literally barely even gets off the tower.