  We summarize the second radio synchrotron background workshop, which took
place June 15-17, 2022 in Barolo, Italy. This meeting was convened because
available measurements of the diffuse radio zero level continue to suggest that
it is several times higher than can be attributed to known Galactic and
extragalactic sources and processes, rendering it the least well understood
electromagnetic background at present and a major outstanding question in
astrophysics. The workshop agreed on the next priorities for investigations of
this phenomenon, which include searching for evidence of the Radio
Sunyaev-Zel'dovich effect, carrying out cross-correlation analyses of radio
emission with other tracers, and supporting the completion of the 310 MHz
absolutely calibrated sky map project.
