The antenna is not properly connected to the docking cradle. Check the connections between the antenna cable adapter and the docking cradle, the antenna cable adapter and the antenna cable, and the antenna cable with the antenna. Check for crimps or damage to the antenna cable. If everything appears correct, the radio, antenna cable adapter, antenna cable or antenna could be defective. You may verify that the radio is functioning correctly by testing for 5VDC output from the antenna connection on the docking cradle. You can verify that the antenna cable adapter and/or antenna cable are good using an ohmmeter. A good cable will produce a reading of 0-2 ohms. (164)