To try and help you i had a quick try to work out the modulation used for satellite broadcast, but could not find anything quickly, still i would think its some type of frequency modulation,
if this is the case then first you build something to transmit and receive in the audio spectrum using whatever carrier frequency you like to learn the basics, (there are 10's of thousands of guides on building FM transmitters and receivers), then once you get the basics down you can move up to trying to De-modulate a live satellite broadcast to your TV, or even just broadcast the feed of one video device to another in your house wirelessly,