Earlier in the week, the Justice Department approved the merger between XM (Nasdaq: XMSR) and Sirius Satellite Radio (Nasdaq: SIRI). If the FCC follows suit, the two rivals will soon become one. So what will a merger mean for shareholders? Will Apple (Nasdaq: AAPL) be a satellite-radio killer? Is Garmin (Nasdaq: GRMN) more friend or foe to satellite radio? Will Microsoft (Nasdaq: MSFT) get in on the act? In this installment of "Fool Video," The Motley Fool's Chris Hill talks with senior analyst Seth Jayson about the post-merger future of XM and Sirius.