The output spectra of three diode noise sources have been measured over the frequency range 13 Mc/s to 178 Mc/s and were found to conform to theory. This method yielded a determination of the output at any particular frequency accurate to about 2%. These diode noise sources were used as the basis for measurements of sky brightness, using geometrically scaled antennas, over the same frequency range. The results of observations of the sky brightness at 81.5 Mc/s, measured with a similar scaled aerial, are presented. The spectrum of the general radio emission from the galactic halo and from the galactic disk in the direction of the anticentre has been determined over the frequency range 13 Mc/s to 404 Mc/s. The spectral index α varies with frequency in both regions. Differences between the two spectra are not significant. This spectrum is in good agreement with recent measurements of the energy spectrum of cosmic ray electrons.