  A system of synchronized radio telescopes is utilized to search for
hypothetical wide bandwidth interstellar communication signals. Transmitted
signals are hypothesized to have characteristics that enable high channel
capacity and minimally low energy per information bit, while containing
energy-efficient signal elements that are readily discoverable, distinct from
random noise. A hypothesized transmitter signal is described. Signal reception
and discovery processes are detailed. Observations using individual and
multiple synchronized radio telescopes, during 2017 - 2021, are described.
Conclusions and further work are suggested.
