a radio wave reception converter receives a radio wave and converts the radio wave into an electric signal , and includes a horn introducing a radio wave , and a waveguide arranged at the rear of the horn for guiding a radio wave introduced by the horn . an insulation sheet is located between the waveguide and the horn to seal hermetically the interior of the waveguide and the horn . the connecting part between the waveguide and the horn is covered with an exterior cabinet . the front opening of the horn is covered with a feedome . the structure facilitates the connecting work between the waveguide and the horn , and can ensure airtightness at the connecting part .