I have 3 large farms in my area, and the real hazard are the older non marked anemometer towers they throw up and then forget about. A few years back, coming back from breakfast in Afton to the east, low level crossing the ridges that run north and south, I spotted one. It had been there for years, was gray galvanized, and well over 100' tall. The site had no ready access to it, and when I found a place to land and hiked over to it, I saw the (relatively) high dollar equipment for recording and sending it's info was gone, just the tower remained. In other words, it was abandoned, out of use, too much trouble to take down, what ever company put it up moved on.
I contacted the Idaho Bureau of Aeronautics, got up to speed on the newer regs for the marking requirements, and then using the county records tracked down the grazing association whose land it was on. Explaining the problem, I offered to take it down, they agreed, and a few days later my Felco cable cutters made short (pun intended) of it. It's still there, no way to drive even a ATV to it, but I did pack out a couple hundred feet of the wire rope for ranch use, my pay.
Another one a few months later, near a major Idaho city, same deal, abandoned, no telemetry on it, but this time I could not get any agency to take responsibility for it, city didn't claim it, said it was a university deal, no one there wanted to stick their neck out by giving permission. On a ridge that is a natural short cut for a scud running pilot, it was a real hazard. Bottom line, it also came down one night, 3 years later now, it's loss has never been noted, as I figured it was truly abandoned and whoever took it down ? did other pilots a favor. Point being, the older non marked ones NEED to come down, and we can do it, no one else will. It takes a couple minutes.....