Cook the pasta according to the package directions, omitting salt and fat. Drain and keep warm.
Heat oil in a large nonstick skillet over medium-high heat. Add onion to pan; sauté 4 minutes or until tender. Add 1/4 teaspoon salt, pepper, and garlic; sauté 1 minute. Add vodka; bring to a boil. Reduce heat, and simmer 3 minutes or until liquid is reduced by about half. Stir in 1/2 teaspoon salt, broth, and tomatoes; bring to a boil. Reduce heat, and simmer 8 minutes. Place tomato mixture in a blender. Remove center piece of blender lid (to allow steam to escape); secure blender lid on blender. Place a clean towel over opening in blender lid (to avoid splatters). Process until smooth. Return tomato mixture to pan; stir in cream. Cook 2 minutes over medium heat, stirring constantly. Remove from heat. Stir in cooked pasta, remaining 1/4 teaspoon salt, and basil. Serve immediately.