Gary Burghoff, the bespectacled Radar on "M*A*S*H," is a hero in the fishing world. He's invented a floating device that carries bait to attract small saltwater fish, which in turn lure bigger fish so that anglers can catch them. "Everyone who sees it hits themselves on the forehead and says, `Oh, my, it's so simple,' " Burghoff said of his invention, which is called Chum Magic. "But so was the paper clip." The device is shaped like a boat's hull and comes in a 35-inch size that sells for $59.95 and a 47-inch model that goes for $79.95. Burghoff, who does much of his fishing in Florida, where he has a home, says he often stays up late to fill orders for his invention. "I feel like a cobbler.