Sirius Satellite Radio said June 6 that it’s exclusive relationship with Ford Motor Co. has been extended through September 2011. The agreement covers all Ford brands in the United States, including Ford, Lincoln Mercury, Land Rover, Jaguar, Volvo, Aston Martin and Mazda.

Ford said that by 2008, about 90 percent of Ford and Lincoln Mercury vehicles would have Sirius receivers as a factory-installed option.

“Subscriptions to Sirius have increased dramatically over the past several years, so it’s only natural that Ford would want to continue to make Sirius’ unique mix of programming available to Ford buyers in the future,” Phil Martin, Ford’s group vice president of product creation, said in a statement.

As part of the agreement, Ford has the option to extend its relationship with Sirius through September 2013. Ford can elect to make the relationship a nonexclusive one beginning in 2009 but it would forfeit all future economic benefits, which Sirius said, “could be significant.”

Financial terms of the agreement were not disclosed.