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 is a conducting surface that is arranged in a geometry that optimizes the 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 & horn components - pdf document
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Detailed instructions for soldering the can components - text & video
Other Horn Designs
Baby DSPIRA Horn - A smaller version of the design presented above can be found in a pdf here and in videos here. This includes a stand as part of its construction. This design operates using all of the other components and software used with the standard DSPIRA horn described within this webpage. 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.