I'd say quite a bit south. The "center" of Cowlesville, according to Google Earth, is Clinton @ Lapp Rd. (Just past Clinton and Bullis.) Ironwood is located at 1964 Folsomdale Rd, and the official address for WNYO's tower is 2034 Folsomdale Rd. The address is still Cowlesville though. You would continue down Clinton until Folsomdale (actually it might be Schoellkopf to Kern to Folsomdale), and turn right, going down Folsomdale for quite awhile, almost until 20A. Here's a map if you're not familiar with the area.
About 5 miles, I'd say, from Cowlesville's "center."