Multi-wavelength Very Large Array (VLA), SOHO and RHESSI observations have been used to study the three- dimensional structure of evolving coronal loops and related signatures of impulsive and long-lasting energy release above active regions. Here, we discuss recent multiwavelength observations of an impulsive hard X-ray burst that was preceded by gradual changes in the structure of an extended coronal loop connecting the active region to one located on the other side of the solar equator, suggesting pre-burst magnetic evolution at different spatial scales. Changes in the 6 and 20 cm brightness temperature were also detected from the opposite footpoint region suggesting some sort of magnetic connectvity across the solar equator.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html