Tvheadend

I am a newbie in descrambling.

I like to descramble channels from Boxer (http://www.boxer.se/) transmitted via DVB-T. I do have two receivers up and running with Tvheadend. I also have a card reader
http://www.adteknik.se/english/usbphoenix.htm
Can it be used?

I don't know what kind of software I need and how to set it up. Can someone advice me? A link to an other site or information right here at this forum.

Thanx