We have a couple of big hickories in, and others surrounding, the runs. We have used CD's with good results (hawks have yet to stoop into, or even sit on run fencing/roof peaks).
If you don't have 6ft., or higher, fencing the CD's can be mounted, shiny side up (see thread below) and slid down over springs liberated from ink pens that have been screwed to one end of old garden poles, etc. with the other end of pole shoved in ground (a breeze is enough to move the CD/spring).
https://www.backyardchickens.com/forum/viewtopic.php?id=44145
If you don't have 6ft., or higher, fencing the CD's can be mounted, shiny side up (see thread below) and slid down over springs liberated from ink pens that have been screwed to one end of old garden poles, etc. with the other end of pole shoved in ground (a breeze is enough to move the CD/spring).
https://www.backyardchickens.com/forum/viewtopic.php?id=44145
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