I believe one could build a heliport in the middle of the Badlands in South Dakota....with not a single structure or human within 75 miles.....and within 24 hours have noise complaints. We had a downtown heliport....just off an interstate highway....and a railroad track......we used the heliport no more than three times per week....and had the neighbors complain about the noise despite the approach path and departure path being overhead the highway and railroad. I ask you....does a MD-500E make more noise than a one mile long freight train or a major urban highway? The vibration from the train alone....would be more a nuisance than the racket of the helicopter. The same neighbors also tried to shut down the EMS operation further down the road....despite the "lifesaving" nature of that operation. It just reminded us of why we displayed the "Please do not Cali-fornicate Oregon! " bumper stickers.