In a horn telescope the horn-can combination together act as the antenna. The metal wire probe in the can picks up the radio waves that are guided to it by the horn. The horn’s conducting surface has a shape that improves radio signal detection by the wire probe. Any conducting surface in the desired shape will work.
The horn panels used in the telescope described here are cheap and easy to work with. However, any conducting horn-can combination with the geometry described here will work as a horn telescope.
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Instructions on how to assemble the can and horn components - pdf document
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Detailed instructions for soldering the can components - text and video
Other Horn Designs
Baby DSPIRA Horn is a smaller version of the design above. Find instructions in this PDF and these videos. This includes a stand as part of its construction. This design uses the same components and software as the standard DSPIRA horn described here. It provides easy use and is good for demonstrations.
Other Designs - Others have built horns of various designs similar to the horn described within this webpage. Information on some of these other designs can be found here.