In have 2 substantial problems when I fly. The first is losing too much altitude during residential rooftop flying and ultimately having to land in the street in front of the throngs looking on in awe. The second was when I got a breathtaking updraft and went aloft well above the power lines. Getting thru them wasn't as much an issue as keeping out of the lines in my flight path as I ventured into areas that I was unfamiliar with. Hi tension lines just plain scared the beJesus outta me...but I wouldn't stop.