More on how to install angle-iron deer fence posts:
https://www.invisible-deer-fence.com/installation/early_steps_6.htm
An economical alternative to round posts is provided by black-painted steel angle-iron posts. These deer fence posts have a smaller cross-section than the round posts and are less likely to be heaved up by frost. However, the angle-iron fence posts are not robust enough to serve as corner posts when the weight of a metal hexagrid fence, falling branches, snow, or deer are likely to create major stress. So in these cases, wood posts or round metal posts should be used on the corners.
For more about wood posts go here:
https://www.invisible-deer-fence.com/installation/early_steps_6.htm#wooden
Post time: Jun-25-2017