  We summarize the radio synchrotron background workshop that took place July
19-21, 2017 at the University of Richmond. This first scientific meeting
dedicated to the topic was convened because current measurements of the diffuse
radio monopole reveal a surface brightness that is several times higher than
can be straightforwardly explained by known Galactic and extragalactic sources
and processes, rendering it by far the least well understood photon background
at present. It was the conclusion of a majority of the participants that the
radio monopole level is at or near that reported by the ARCADE 2 experiment and
inferred from several absolutely calibrated zero level lower frequency radio
measurements, and unanimously agreed that the production of this level of
surface brightness, if confirmed, represents a major outstanding question in
astrophysics. The workshop reached a consensus on the next priorities for
investigations of the radio synchrotron background.
