There is a guy in the US that goes snooping around Area 51 and found himself a way to hike up onto them there hills surrounding. He had with him a telephoto lens that was about 6 feet long attached to his Camcorder.
Best to be careful doing things like that (especially in cowboy country). I remember what happened to
Mick Travis when he tried it: armed soldiers appear out of nowhere, black bag over the head, hussled off to an underground room, let the torture-assisted interrogation begin!