The message was garbled and awkward, but Edward was able to make it out.  The fact that the message had come from a radio that was not even plugged in suggested that the message was likely from one of the High, and if the High were reaching out to him it was probably something important.  Unfortunately, it was also terribly vague.  "Come?  Come where?" Magus asked the radio, or rather, whoever had manipulated the radio to speak to him, most likely the High Electric since he was communicating via an electronic device, and he was the "patron" of elementalists such as Magus.