Relativistic ejections are a common consequence of accretion processes onto black holes and neutron stars. They are associated with supermassive black holes as large as million-billion solar masses in active galactic nuclei (AGN) as well as stellar mass black holes and neutron stars in X-ray binaries (XRBs). Assuming that the physical timescales related to the accretion and ejection processes scale with the mass of the compact object, 1 hour of an XRB corresponds to ~1000 years in an AGN. For this reason XRBs represent a unique tool to investigate the jet emission mechanisms in relation to the accretion conditions, on timescales smaller than human life-time. I will present my studies of an XRB characterized by a faint jet, representative of a growing family of sources. Faint jet emitters can significantly help to understand the coupling between the inflow and the outflow processes. Jets from compact objects are also a source of energetic particles that can inflate cavities and nebulae that deeply change the surrounding medium. This kinetic feedback from AGN acted to regulate the growth of galaxies, helping to determine the current form of the universe. Recently it has been discovered that XRBs act on the interstellar medium in a way similar to AGN. I will discuss some recent results, showing how a revolutionary radio telescope (the Low-Frequency Array, now partially effective) will significantly improve our knowledge of these phenomena.