As the police hunt continues for a radio hoaxer who illegally communicated with aircraft over Melbourne continues with no new leads, an air traffic controller has broken ranks to warn the "menace" hoaxer could endanger lives.

The air traffic controller, emailing Fairfax Media on the basis of anonymity, said the hoaxer was well-known to air traffic controllers because of "continual disruption for whatever personal gain" and he could "eventually compromise safety. He is a menace."

Air traffic controllers working from Avalon and Melbourne airports had built up a profile of the offender, who is breaking federal laws under the Radio Communications Act and Aviation Transport Act and presenting a massive security risk to the airports and airlines.

"A male person who has listened to the comms (communications) between ATC (air traffic control) Tower Staff and pilots has mastered enough lingo and knowledge to attempt impersonations of an ATC Controller. He also has portable transmitting/receiving equipment, which is monitoring: Tower, Emergency & Avalon Frequencies and a vehicle to move around in, making tracking and discovery of him very difficult. On a few occasions (from 25 Oct onward) he has attempted to communicate to pilots to override ATC controllers to try and cause disruption, in most cases he has been ignored, calls from Tower to aircraft pilots to disregard unauthorised transmissions."