Large UFO hovering over a high line tower—Chased by Airforce Helicopters near Denver, CO in 1962.

REturning frm a fising trip in late afternoon, my stepdad (an Army Sargent), myself,  and three Soldiers under my stepdad's command at Fitzimmons Army Hospital, saw a large elliptical object hovering over a highline power tower as we topped a hill looking West into the setting sun.  The shape appeared in  silhouette against the sun.  The four lane highway was divided by a median down which stretched the highline towers.  Below the object, at least 20 vehicles were pulled off the road into the median and people were out of the vehicles looking up at the object.  When we arrived at the scene, my stepdad pulled off the road into the median and we all got out to look up at the object.  From below, it appeared to be a large circular craft with a diameter of approxamatly 50 or sixty feet across.  There appeared to be a section somewhat inside the outer rim that was turning counter clockwise, but it was very difficult to see this movement.  While we watched, the craft made no sound that we could hear.  After we had observed the craft for apporximately 20 minutes without any noticible change in it, we began to hear the sound of approaching helicopters approaching from the West from the diirection of Lowery Airforce Base.  As the three copters approached to about a mile distant, the craft above us began to silently move away toward the East.  It seemed in no hurry to leave, and kept the distance between itself and the three copters approxamately the one mile distance.  We watched until the object and then the three copters had disappeared over the hill we had decended from, and then got back into our car and resumed our trip home.  After we dropped off the three soldiers at their barracks on the base, we rove home, and my Stepdad, called Lowery Air Base to report the object.  He was told they knew about it and requested he keep silent about the sighting.  This is the first report I've made of the sighting to anyone.  My stepdad is now dead and I can't remember the names of the three soldiers, so I give this rep! ort on t he off chance that one of the other people who obviously saw the same object we did, will have already come forward with a report or will come forward if the read this, to substantiate the truth of this UFO sighting.
Date is approximate.  PD