I haven't heard anything on 11034kHz and it's not listed anywhere I can find. It seems very coincidental that their 'real' frequency is 15034kHz - one digit out - could it just be finger trouble. Did you listen on 15034 when you were hearing 11034 - perhaps they have two transmitters and they swap them over on a weekly basis. Common practice, one transmitting and one on hot standby - carry out a maintenance check on the standby on a different frequency and forget to put it back to the right frequency - end of the week, change over to the other transmitter and ...oops!