The Home Depot, GEICO and JC Penney are the top three national advertisers at radio for 2018—each repeating their rankings from last year. The mantra “More saving, more doing… That’s the power of the Home Depot” was heard some 2.57 million times over the airwaves, according to data provided to Inside Radio by Media Monitors, which tracks the top marketers based on spot volume in 85 markets.