On large sheet of waxed paper, arrange pancetta slices in 2 rows, overlapping to form rectangle the same length and width as tenderloin. Place beef on edge of one long side of pancetta. Sprinkle beef with garlic and rosemary. Roll up tightly, using waxed paper as a guide. Discard waxed paper. Tie beef with heavy kitchen string, securing at 1-inch intervals. Place on cookie sheet. Brush with remaining 1 tablespoon oil.