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Looks to me like it was just broadcast over a FM channel on the course. no sub required.

Something pretty cool offered to attendees to the U.S. Open this year:

http://www.usopen.com/en_US/news/articles/2009-06-11/200906111244760288703.html

American Express CourseCast On-Site
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From Orbitcast: http://www.orbitcast.com/archives/sirius-xm-iphone-app-gets-over-500000-downloads-in-four-days.html#more

513,319 downloads in 4 days. Not bad :)

If we are to believe that ALL of...