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Topological insulators made of bismuth chalcogenides are promising materials for sources and converters of terahertz radiation. The operation of a topological insulator nanofilm photoconductive antenna is demonstrated. The generation of the third and fifth harmonics of the terahertz frequency radiation in topological insulators of various chemical compositions is observed This research was supported by RFBR Grant(s) # Russian Science Foundation Grant No. 22-22-00758