Good Digital antenna cheap!

Step 6 Need amplification?

You can add passive (no electrical power needed) amplification to your signal by using a parabolic reflector made of sheet aluminum. The graphic shows the aluminum strips (here in dark red) set off from a flat parabolic reflector also known as a parabolic trough. You would devise your own scheme for mounting the reflector and the aluminum strips.

Note: I have always wanted to try making the reflector from a wire screen. It should work, but it would need more support to hold its proper shape.