Trim the silks and any loose leaves. Place the corn, in husks, directly on the center rack in the oven. Bake for 30 minutes. Remove from the oven and allow to cool.
Add the vinegar, salt, and pepper to a small bowl, Slowly whisk in the olive oil to emulsify.
Once the corn has cooled, remove from the cob with a knife. Slice the tomatoes in half and chop the basil. Add to a large bowl and mix together with the dressing. Serve immediately or chill.