HOW TO INSTALL A McGREGOR DEER FENCE: ANGLE-IRON (STEEL) POSTS
EARLY STEPS, CONTINUED
An economical alternative to round deer fence posts is provided by black-painted steel angle-iron posts (sometimes referred to as "angle-steel" posts. These posts have a smaller cross-section than the round posts and are not robust enough to serve as corner posts when the weight of a metal 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.
If you get angle-iron posts you should also be prepared to deal with rust. Inspect the posts at least once a year and spray any rust spots with rust-preventive paint. Like other metal posts, angle-iron posts seem less natural (but also less visible) than wood. They do not grip the soil as well as round metal posts, and so they are not recommended for use on sharp turns or at sites with loose soil unless they are placed in cement footings.
Video: Installing Angle-iron Posts
To install an angle-iron post for a 7-foot deer fence, simply get on a short stepladder and drive the post down with a manual post driver until seven feet are above ground, testing it periodically from the front and side with a carpenter's level to make sure it goes in straight. If the soil is rocky, use a digging bar as described above in the section on round posts.
When you are putting the deer fence rolls in place, attach the fencing to each angle-iron post with five or so eight-inch heavy-duty zip-lock ties, but in addition pass the zip-tie through one of the holes in the angle-iron post so as to prevent the zip-tie from slipping down the post. As noted above, the monofilament line or tie wire at the top of the fence can also be attached to the fencing with zip-lock ties, although this job can be done faster and better with a hog-ringer and metal hog-ring staples
Wooden Deer Fence Posts
Video: Using Trees as Posts and Installing Wooden Posts
Because they are thicker and stronger than metal posts, it is sometimes worth using wooden posts at corners (only if no trees are available) and at places that can be expected to bear major loads. Avoid using untreated wood, because most untreated wood in contact with the soil will rot in a year or two. These posts should be set 3 feet into the ground (4 feet at stress points). Like other posts, they should be spaced 15 feet apart for metal hexagrid fencing and 20 feet apart for polypropylene fencing. The deer fencing should be loosely attached to each post with five or so U-nails. As a general rule, the fencing should be pulled tight enough so that it stands straight, but no tighter.