Slice French bread into 24, 1-inch slices. Arrange bread slice on a baking sheet. Drizzle bread with 2 tablespoons olive oil, turn and drizzle bread with remaining olive oil.
Grill bread slices for 2-3 minutes, or until lightly toasted. Remove and top with diced cantaloupe. Top with prosciutto and basil. Drizzle with vinegar just before serving.