Mostly, the signal goes into the Quabbin Reservoir.
Only a tiny lobe sprays a signal into Springfield. WNNZ's beam heads Northwest; or at least it used to by my experience.
In 1988 I worked at WHEN Syracuse during the week and drove home to Blandford Mass on weekends. I would start to pick up WNNZ on the east side of Utica NY, back in the day when 640AM would simulcast the Channel 40 news. I'd have it on up until it the pattern change at sunset.