The radio wars are escalating. In a one-two punch aimed at enlisting regulators to their cause, the National Association of Broadcasters (NAB) and National Public Radio want the Federal Communications Commission to investigate alleged misdeeds by satellite radio companies XM ( XMSR ) and Sirius ( SIRI ). On Oct. 12, National Public Radio CEO Ken Stern wrote to FCC Chairman Kevin Martin alleging that the satellite broadcasters' devices interfere with NPR broadcasts. And last week, David Rehr, president and CEO of the powerful NAB, fired off two letters to Martin alleging several regulatory violations.