With about 90 percent of the population covered by its signals, public radio has reached all the ”easy” regions and is now filling in the gaps, usually in less-populated areas. Even when there’s money to add repeating transmitters, however, there are often technical glitches. The furor has died down somewhat in recent weeks, but when public radio first came to Chillicothe, Mo., in August 1993, hundreds of people wanted it to go back where it came from. In an area where households without cable were accustomed to picking up Kansas City Royals games and other programming on weak signals from TV stations 70 miles away, the new 100 kw FM signal was so much closer that it blasted the ballgames right off the tube. Though the outrage was new to Chillicothe, similar cases of ”blanketing interference” often had occurred and subsided elsewhere and will arise again in other remote areas as public radio (or kind of station) fills the gaps in the national map of FM service.