A tunable broadhead is disclosed for rotating an elongated body of a broadhead relative to an extension member. The tunable broadhead enables the blades of a broadhead to be rotated relative to an arrow shaft into which the tunable broadhead may be attached to tune arrow flight from a bow. In particular, the tunable broadhead may include an extension member rotatably attached to a generally elongated broadhead body, wherein the extension member may be releasably affixed in position with a releasable locking device so that the broadhead may be tuned by rotating the broadhead relative to an arrow and locking the broadhead in position.