To the best of my knowledge, 162 – 174 MHz is assigned solely for use by federal agencies. However, while searching the FCC database I came across Port Authority frequencies in the 173 MHz range. How is this possible? Are public safety agencies allowed as long as they are using low power?
http://wireless2.fcc.gov/UlsApp/UlsSearch/licenseFreqSum.jsp?licKey=1226741
http://wireless2.fcc.gov/UlsApp/UlsSearch/licenseFreqSum.jsp?licKey=1226741