Do as the other question askers do and , Do This->
http://forum.tvfool.com/showthread.php?t=4. I think it is best use the USB tuner that is made for use with the Boxee. You can also contact these business and see if adapter is available.
http://www.ramelectronics.net ,
http://www.hdtvsupply.com , you can also go to Boxee forum.