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A hard hom for dual band operation is designed. Emphasis has been put on low cross-polar performance over both the Rx and Tx bands in the Ka-band multimedia application. The horn has also been designed with manufacturability in mind, with direct transition from the metal section to the corrugated section, and, with a corrugated section which is slightly conical with constant number of corrugations. The horn operates with high efficiency at the lower band (17.7-20.2 GHz) and medium efficiency at the higher band (27.5-30.0 GHz), and it has a maximum cross-polar level within the main beam which is low over both bands. The return-loss is below -35 dB over both bands.