Advertising of homeowner and personal-property insurance more than doubled in 2012, according to Kantar Media, and is expected to grow even further as real-estate values continue to improve. Nationwide Insurance has kicked off a television ad campaign for a premium policy that offers better reimbursement for lost or stolen property, and plans to dedicate half of its first-quarter ad spending on property-related policies. The effort comes as Progressive and GEICO push auto-home insurance bundles.