That’s four consecutive weeks as the top radio advertiser according to Media Monitors. Walgreens placed over 57,000 ads on radio stations all over the country last week. Burger King was a distant second with just under 37,000 ads. GEICO held on to the number three position with 35,239 commercials aired. Jackson Hewitt was fourth with 27,828, followed by Lowes, rounding out the top five, with 27,350.