  Hadronic antenna patterns provide a tool able to diagnose different patterns
of colour flow in large-E_T jet events. They reflect the underlying
short-distance dynamics, and are sensitive to colour coherence and interference
between the initial- and final-state partons. We discuss how hadronic antenna
patterns may be used on large-E_T events from the Fermilab Tevatron or the CERN
LHC to distinguish between conventional QCD and new physics production
mechanisms such as a possible Z' boson or compositeness.
