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There is no proof living under lines causes any medical problems. You need much higher levels as found in the air-gap of motors not under high tension wires.
linknoid; You are correct in the loss area BUT! There is a lot of energy lost to heat along those cables. They actually control the current thru the cables as related to this heat.
In the long term they want to run them below 600F because the wire will anneal and weaken greatly.
In the short term all transmission lines are designed so that at the maximum expected loading, on a hot day, they don't sag below a certain ground clearance. Many blackouts occur because the line is over loaded in hot, still weather, and the lines sag into trees.
A lot is lost thru induction via fences and metal structures. That's usually hard to prevent and in fact necessary as large metal structures that are under the lines and not grounded can pose a "touch hazard". So in grounding them the energy escapes to the earth. Just don't let the power company find you using any of this.
A farmer noticed that he'd get jolted touch his new fence in hot dry weather. (Poor grounding in dry soil.) He decided to hook his fence to a load. Then wasn't enough so modified his fence to better isolate it. Then he added to it to increase the "reception". They figured it out and he was taken to court.. I guess they take that as energy stealing.
If you look at fences around substations and under transmission lines you can find often find grounding rods tied to them.
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