Here is a cool video from MIT showing a fixed wing glider can land on a power line. At the start of the video I was not too impressed because they where using a vicon tracking system (basically like GPS on steroids giving you 500hz exact position measurements if no-one knows about it) But from watching the video it seems they took it 1 step further to actually let the glider localize the power line using only hte magnetic field from it which is pretty cool. Allowing you to land on a power line to charge your plane. Might be funny to see some legal issues if everyone starts tapping into the national grid to charge their drones 
If anyone is keen to read the details you can find the paper here - Robust Post-Stall Perching with a Simple Fixed-Wing Glider using LQR-Trees