Hi. I do a lot of horse trekking and walk trekking with my donkey and I use this kit... to keep my friends safely grazing and resting for the night. If ground very dry, use a second wire for return....
https://www.agriloisirs33.com/kit-cl...-equestre.html
It weighs very little and should do the job to keep any farm animals away from the helicopter... apart may be chickens.
If I may give you my advice, get in touch with the breeder (sheeps, goats, horses, pigs as, a few years ago, I had about 12 abortions in my herd of 130 goats close to kidding and it took me two months to get back to my normal daily milk yield... after a Puma (of the noisy, smelly and blowy type, not the big cat!....) landed in the field next to the woods they were grazing in. Five hours to get them back to the shed!