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In the coming years a new insight into galaxy formation and the thermalhistory of the Universe is expected to come from the detection of the highlyredshifted cosmological 21 cm line. The cosmological 21 cm line signal isburied under Galactic and extragalactic foregrounds which are likely to be afew orders of magnitude brighter. Strategies and techniques for effectivesubtraction of these foreground sources require a detailed knowledge of theirstructure in both intensity and polarization on the relevant angular scales of1-30 arcmin. We present results from observations conducted with the Westerborktelescope in the 140-160 MHz range with 2 arcmin resolution in two fieldslocated at intermediate Galactic latitude, centred around the bright quasar3C196 and the North Celestial Pole. They were observed with the purpose ofcharacterizing the foreground properties in sky areas where actual observationsof the cosmological 21 cm line could be carried out. The polarization data wereanalysed through the rotation measure synthesis technique. We have computedtotal intensity and polarization angular power spectra. Total intensity mapswere carefully calibrated, reaching a high dynamic range, 150000:1 in the caseof the 3C196 field. [abridged]

Foregrounds for observations of the cosmological 21 cm line: II. Westerbork observations of the fields around 3C196 and the North Celestial Pole