Illinois head men’s basketball coach Brad Underwood has a reputation for being a hothead. But on Sunday, the Illini head whistle showed a softer side. Before Illinois’ game against Chicago State, Underwood gifted a basketball signed by the entire team to the wife of Big Ten Network announcer Mike Hall. Hall’s wife, Linda, is an Illinois graduate and, of course, a big fan of the basketball program. Last month, the couple went public with Linda’s …