Because his voice is perfectly pitched (rich and sonorous) and his mind is perfectly bent (far to the right), this former Canadian and ex-baseball player is a talk-radio natural. He doesn't go in for "that Black Helicopter garbage," but neither does he place any credence in evolution, the moon landing, or the Cold War. (He suspects the fix was in.) What does he believe in? Ronald Reagan, "The Clinton Chronicles," the Committee of 300 (if you don't know, don't ask), and his regular Wednesday guest, "the number one gold and silver man in the country," a hustler named Larry Heim, who counsels Dan's listeners on the safe refuge only precious metals can afford from the coming crash. In his disquisitions on the latest public infamy (generally of the Clintons), Gregory tends to get carried away during his one-hour show, which airs at 10 a.m. weekdays, often fumbling around for words. At the height of Pat Buchanan's "religious war" campaign of '92, he practically asphyxiated himself in exhorting his listeners to get up and march into the streets. "What are you waiting for?" he screamed. We were waiting for him.