The importance of cosmic rays and magnetic fields for the physics of the interstellar medium and the evolution of galaxies is demonstrated by a number of recent numerical simulations. We present new observations of the cosmic ray electron transport as well as the magnetic field strength and structure in galactic halos from radio-continuum polarization studies of edge-on disk galaxies obtained by the CHANG-ES (Continuum Halos in Nearby Galaxies - an EVLA Survey) project.The observations are discussed in the context of transport models for Cosmic Ray Eelctrons (CREs) from the star-forming disks into the halo. The observations also allow to derive the magentic field structure in galactic halos. In addition, it is demonstrated how recent low frequency observations of edge-on galaxies with LOFAR help to further constrain the problem.