OM op whistling into his mic going "hola...hola hola hola" over and over...doesn't seem to be actually talking to anybody so I'm going to say radio checks. 6890 kHz 6.890 MHz LSB mode. Close to the lively 6900 kHz frequency, a common calling frequency or home channel for Spanish speaking freebanders. There's a net on 6900 LSB (and sometimes 6900 USB as well) basically every night with Spanish speaking ops.