Never been to that specific one but I've investigated a few derelict grain elevators over the years and they have this quality to them that's hard to pin down. Something about the geometry I think - those tall narrow silos create infrasound resonance under certain wind conditions and that absolutely can produce feelings of unease, dread, even visual disturbances at the periphery. Vic Tandy's work on 18.98hz is worth reading if you haven't already.
That said I don't want to be the guy who just reduces everything to physics because some locations do seem to carry something beyond that.
What kind of feeling are we talking exactly? Directional, like it's coming from a specific point on the structure? Or more ambient, like it's the whole area? And what time of day - I've found these agricultural sites behave very differently between dusk and early morning. Would love to hear more detail from anyone who's actually been there in person.