This is bad news, but important to know. I use electronet exclusively. I'm hoping that separated cocks will stay separated if they have their own hens. I hatch with broodies, in the flock. That has been working good. I like the chicks growing up with the flock and learning about hawks and other things. Next year I would like to separate the cockerels to assist with evaluation and to restrict their range somehwhat and try to fatten them up. Do you think 16-24 month old cockerels will stay inside 42 inch electronet if they see/hear the pullets 3-400 hundred feet away?
I can't answer the question about the electronet because every time that I've tried it, either a steer gets tangled in it or the bull knocks it down!
In regard to hawks, I have been very lucky. There are hawks overhead every day and a redtail roosts on a power pole next to the pastures. Yet, Ive only had 2 losses to hawks in 14 years. My pastures are completely open and I learned that the hawks will leave mature sized chickens alone, but will kill youngsters if they are out on pasture. That's why I start the little ones out on the lawn, next to the house, where there are trees & bushes for cover. Chicks on pasture here are chicken nuggets for the hawks. Even with the mobile coop to hide under.