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We present follow-up observations at 5, 8 and 30 GHz of the K-band NorthernWide Survey (KNoWS) 20 GHz Bright Sample, performed with the 32-m MedicinaRadio Telescope and the 32-m Torun Radio Telescope. The KNoWS sources wereselected in the Northern Polar Cap (Delta > 72 deg) and have a flux densitylimit S(20GHz) = 115 mJy. We include NVSS 1.4 GHz measurements to derive thesource radio spectra between 1.4 and 30 GHz. Based on optical identifications,68 per cent of the sources are QSOs, and 27 per cent are radio galaxies. Aredshift measurement is available for 58 per cent of the sources. The radiospectral properties of the different source populations are found to be inagreement with those of other high-frequency selected samples.

A 20 GHz Bright Sample for Delta > 72 deg - II. Multi-frequency Follow-up