Fresh Corn Dungeness Crab Chowder

Name: Fresh Corn & Dungeness Crab Chowder
Ingredients: 1 pound Dungeness crab meat; 2 cups fresh corn kernels (3 ears), cobs reserved; 3 cups diced Walla Walla Sweet onion (or any sweet onion); 1/2 cup diced red bell pepper; 1/2 cup diced fennel, plus a few fennel fronds for garnish; 1 cup chicken stock; 3 cups whole milk; 3 tablespoons butter; 2 tablespoons flour; 1 bunch fresh basil leaves, thinly sliced; salt; pepper