Whistling on 8891 aero frequency

While listening to Gander OAC on 8891 kHz last night, I noticed that somebody kept whistling at random. It definitely sounded intentional but thankfully the culprit signal was weak and did not appear to cause any problems with working airliner traffic. I have uploaded a short audio clip of this jamming which can be listened to below.

Listen to the audio 

 

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