Your analogy is slightly oversimplified because it assumes a fully functional fence (probably two, with a road between them) between the wheat fields and the ca

Your analogy is slightly oversimplified because it assumes a fully functional fence (probably two, with a road between them) between the wheat fields and the cattle. The cows might gaze longingly across the road at the wheat fields and the wheat farmer might smell some manure while harvesting, but the fence is fully functional. In real life, a 2200 lbs steer might not think much of a mere barbed wire fence or high-voltage tickle separating it from the wheat field...but that's stretching the analogy a bit too far into the weeds. A better analogy needs to understand that the filter on both sides of the equipment is imperfect. Replace the altimeter with, say, Mount Rushmore National Monument, and replace the wheat farmer with, say, a putrid landfill, sewage processing operation, or CAFO chicken farm. Neither the monument nor the viewing areas extend beyond the surveyed boundaries of the monument. But part of the appeal is that it's a pleasant, quiet, natural place in the middle of a national forest: abutting it with something smelly, noisy, or ugly might be legal but would harm it even though it doesn't extend past the property markers. Personally, I do think they need to upgrade and phase out the altimeters to be more tolerant against interference. But they're not necessarily broken, just too slow to adapt past the scope and capabilities of the tech available in 1967.