GEICO has planted itself atop the Media Monitors chart for the leading radio advertisers across the nation. That’s three weeks in a row, while its perennial advertising rival, The Home Depot, has taken a slide down the chart, falling from seventh to 26th. GEICO ran 57,892 spots last week. ABC came out of “nowhere” to take over second position with a healthy 51,175 spots. Rounding out the top five are Indeed (46,178) which held fast to third position, NBC (38,566), and Progressive (31,259). A third network, CBS, ranked well, landing in eighth place with 23,328 spots.