WASHINGTON (AP) — A measure of U.S. home prices rose 6.3 percent in October compared with a year ago — for the largest yearly gain since July 2006.The jump adds to signs of a comeback in the once-battered U.S. housing market, but the news isn't all good for Illinois.The report indicates home values increased in 45 states in October — with the biggest increase in Arizona, where prices rose 21.3 percent. The five states where prices declined were: Illinois, Delaware, Rhode Island, New Jersey, and Alabama.Core Logic today also said prices declined 0.2 percent in October from September, the second drop after six straight monthly increases. The real estate data provider says the decline reflects the end of the summer home-buying season.