>173.350 PL 151.4 (VERY ACTIVE IN PHOENIX) That frequency is not a federal assignment. Here are the users in Arizona: http://wireless2.fcc.gov/UlsApp/UlsSearch/results.jsp - Chris -- Chris Parris Fed Files Columnist Monitoring Times Magazine chrisparris at monitoringtimes.com http://www.monitoringtimes.com Fed Files Blog - http://mt-fedfiles.blogspot.com/