Windows Media Center 2005 supports dual TV tuners. Can I install another TV tuner?
Windows Media Center 2005 only supports dual TV tuners if they are identical. Gateway only plans on shipping Media Center 2005 with a single TV tuner. Any additional TV tuners are not supported.
Additionally, if another identical TV tuner is added, two set-top boxes would be required to configure the TV signal on the two TV tuners.