Boston public radio station WBUR is expanding its reach on Cape Cod and the Islands, announcing on Tuesday the purchase of the 92.7 FM signal in Tisbury currently held by rock station WMVY.

For WBUR, the acquisition for an undisclosed sum fulfills a two-decade effort to expand its presence in the area and will allow it to broadcast to as many as 60,000 new listeners, starting early next year.