High pitch tones were probably an encounter with a UFO in Crescent City California during the early 1970s

I was a teenager at the time and overheard two very high pitch tones.  The tones were witnessed by another person of similar age in the same room.  Both of us dismissed the tones as a dog whistle at the time.  The tone started in one pitch and many moments later appeared to change pitch to a second tone.  We were actually in a bedroom when we heard the tones.  It is difficult for me to remember the exact date, time, and month because this was something that happened a very long time ago.  I do recall that it was raining at the time this was going on and for that reason I listed November as the most probable month of the event.
 A number of years later I attended a support session for abductees that was held in Seattle on Aurora.  Although I have never been abducted, I learned from the group that high pitch tones are one of the signs associated with contact with a UFO.  For that reason I have decided to file a report.
 I don't think I can provide you the witness name.  It has been too long ago.  I can't give consent to a collect return call, but if someone e-mails me or calls me, I am happy to call them back at my expense.  My e-mail address is ((e-address deleted))
Witness indicates that date is approximate.  PD