Spectra of four compact objects detected with LOFAR, and also reported at 408 MHz by Wills et al. (1997). These objects show no low-frequency turn-over at LOFAR frequencies. LOFAR data points are plotted in red. Non-LOFAR data points are VLA and MERLIN, as presented in Table 2 by Allen & Kronberg (1998). A simple power law (S_ν ∝ ν^α) was fitted and is plotted as a dashed line. The best fit α is given in the respective figure title.