You will need mimimum a 6 ft dish. Then you need to purchase a C-band lnb (easier route) that will allow for circular reception. Basically these lnb have something called a dielectric insert. It is usually a small piece of plastic (made of different materials) that you will insert into the lnb assembly. This will allow the signals to be received in your FTA receiver in circular polarization ( Right or Left hand polariztion). If you take the insert back out you will get linear polarization again (Vertical or Horizontal).
There are lnbs like DMX741 that comes as one piece with the lnb and feedhorn integrated, which is the one mentioned above. There is no motor to change polarities. They use the voltage in your receiver to accomplish that task. You will attach the scalar piece to the tripod arms of the dish and insert the lnb with the insert and once peaked, you will get circular reception.
The other type of lnb like the Chaparral brand requires buying lnb separately, and then attaching to a feedhorn with a small motor to change polarity/skew. This is more expensive and involved, as you need to buy a feedhorn assembly (Chaparral Corotor Plus) with insert that supports circular (still need to use the dielectric insert). You will need to have a receiver that can also control skew. This route is more difficult, expensive, and requires more technical knowledge. The advantage this gives, it allows reception of weaker signals.
The FTA receiver is also becomming an important decision. Signals on NSS806 are not all DVB, but are also changing to DVB-S2 format, and some channels are Mpeg4 HD. Don't forget that there is also a vast majority of channels in other formats like Powervu, Bliss, Conax, which is premium scrambled service that cannot be received, unless you live in the country providing the subscribed service.
Attached is a pic of my 6 ft dish and DMX741 lnb used to receive NSS806 (circular sats). this lnb gives me C and Ku band reception.