There is very little public land in Nebraska, so if you don't own land or have access to land owned by family or friends, you're pretty much SOL
I grew up hunting in ME, NH, and VT where, at that time, any land that wasn't specifically posted was assumed to be open for hunting. My Parents owned around 250 acres and the only part that was off limit to hunting was the area in and around the high fenced apple orchard and the 5 acres around the house, barn, and out-buildings. My Parents were pro-hunting, but they didn't allow vehicles to go off-road on the land and there were always more than a little pissed when they found that someone had trespassed to cut firewood or Christmas trees.
