No Sighting, only sound

8:30 PM my husband was trying to catch the recorded evening news for projected weather. It had not recorded so the network kept giving us PBS to watch. It kept quitting and replacing with something else. My husband was in the living room, I was going back and forth from a bedroom with a sewing project and the living room. From the bedroom, I heard what sounded like a helicopter around our place. I stepped outside to try to see something. It was totally dark outside. There were no lights on and I could not get a definitive direction from where the noise was coming. It sounded larger than the helicopters we usually hear if they are searching for an escaped convict or someone. It also didn't fit the description of Bonneville Power searching the power lines. This sounded larger, but no lights on or any way to see it. It stayed around here about 10 minutes. I asked my husband if he heard it while I had the door open from the living room. My husband was busy with the television. He said later that he was concentrating on the television and not on that. He was not paying attention to it. It was loud and he missed it. I saw nothing, but heard something very large.