The noise from the helicopter has been described as the equivalent to a truck going past on a highway, and it lasts for around two to four minutes. The helicopter will fly back and forth across the county in gridlines, so it will then return near a given location approximately 30 minutes later, but at a distance of about 2,100 ft (650 m) away.
During other SkyTEM projects, most animals are unfazed by the helicopter, but some younger animals could be frightened. Horses could be frightened in some instances. However, some surveys conducted close to farms have reported no issues with horses or any other animals.
If you are concerned about the effect helicopter flights might have on you or your animals (particularly horses), email kemwaks@illinois.edu or phone 217-265-0528. Project leaders can let you know the flight information, times, and locations of when the helicopter will be expected in your area.