A 20 GHz Bright Sample for Delta > 72 deg - II. Multi-frequency
  Follow-up
  We present follow-up observations at 5, 8 and 30 GHz of the K-band Northern
Wide Survey (KNoWS) 20 GHz Bright Sample, performed with the 32-m Medicina
Radio Telescope and the 32-m Torun Radio Telescope. The KNoWS sources were
selected in the Northern Polar Cap (Delta > 72 deg) and have a flux density
limit S(20GHz) = 115 mJy. We include NVSS 1.4 GHz measurements to derive the
source 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. A
redshift measurement is available for 58 per cent of the sources. The radio
spectral properties of the different source populations are found to be in
agreement with those of other high-frequency selected samples.
