Pressonitiss seems to be some type of strange thing that make's normally sound thinkers into blinkered half wits,
Where I live we are surrounded by reasonable smooth yet hard rolling hills , part of the mid Pennines in the UK, many helicopters fly directly over my office/house in many different types of weather, you would be supprised at the amount of really good helicopters that fly low to keep in touch with mother earth, but then "just to get over the hill top" go IMC, with the Pylons and radio masts that also abound, many times have I held my breath waiting for that awful crump, and then silence!
These comparativly low hills, have captured many aircraft, and helicopters, flown by Pilots who should have known better, but yet took a chance!
Peter R-B