Instructables

how to build a satellite tv receiver?

anyone know how to build a free-to-air (fta )satellite receiver?

Thing is, you cannot practically build your own, even if you could buy the silicon, you aren't going to be able to get a multi-layer, fine track PCB made, apply the silicon, and test it, let alone write the software drivers to configure it.

As Bassbindeveil says, buy a DVB card
Buy a DVB tuner card for your computer.  That's about the closest you can get to "building" one.  It'll come with software for watching FTA broadcasts, or there's various other software like MyTheater.  Don't get a DVB-T card; those are for terrestrial DVB TV broadcasts. 
From off the shelf parts ?