How to design a receiver of 900M ?

Hi there:
Now i designing a receiver of 900M about 50m.I would like design a simple circute.Can anybody help me?

You are 50 meters away? It is easier to design if you are closer, maybe only 1/2 a meter from the computer screen.

?50m? could be fifty miles also, and this would be a big problem using a simple circuit.
You will need a complicated circuit and unfortunately I cannot help you.

it is easy and choose a modulator