Does anyone know the frequencies that the local helicopter pilots would use... especially for news helicopters? Is there a common air frequency that all local air traffic (ie, not commercial airlines out of PDX) uses, if they are flying locally? Or is there also a radio signal to/from the helicopter and the tv station that we can pick up? Also, on rare occasion, I see army helicopters flying over the Milwaukie/Clackamas area, possibly from Withycombe National Guard Base. Does anyone know what frequencies they would use?