With spring comes all the gardening and home improvement projects. Which likely explains The Home Depot’s huge tally of radio ads, making it radio’s biggest advertiser for the second week in a row. Media Monitors reports the chain ran a huge 85,578 spots nationally last week. Former lock for number one, GEICO, holds steady at number two with 45,946 spots. Likewise, Lowe’s (38,875) and Progressive (30,625) stayed put in third and fourth place respectively. Rounding out the top five is the US Department of Transportation (28,062) which was unranked last week.