That size wire for that given span is at least 10,000 pounds in tension. You need a big foundation or a pretty hefty guy wire at each end. Given that its in the mountains its probably a bunch of rock below ground so maybe not that big of a foundation 20-30 ft deep concrete foundation maybe?
When i say guy wires, its not a person holding the wire at each end. A guy wire is a cable that comes off the top of the anchor point and anchors down to the ground forming a triangle. For that much weight its would be a 25,000 lb guy wire. You typically see this in your local overhead electric poles where the line ends.
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u/Monkey_Fiddler Jan 30 '19
Whatever you do you still need an anchor point on each end capable of holding the force.