higher than Gilderoy's kite

Extremely high; so high that it can hardly be seen. "Gilderoy" was the nickname of notorious 17th-century highwayman Patrick MacGregor, who was hanged at a time when the height of the gallows corresponded to the severity of a criminal's misdeeds. Thus, MacGregor was hanged higher than his accomplices—like a kite in the sky. Why did you put the dishes on a shelf higher than Gilderoy's kite? You know I can't reach anything up there! A: "Can you see the plane?" B: "It's higher than Gilderoy's kite! All I see is a tiny speck!"