Here, in the forefront is a typical terminal post. This, for a 4' high fence. Each terminal in fencing (end, corner or gate post) should have one hook-up band (tension band) less than the height, installed. Here, there are three tension bands for each hook - up.
Vinyl as well as galvanized wire should be graded properly. The diamonds should form virtually straight lines when looking down the fence line.
You can also see here, if you look to the bottom right of the terminal post, the bottom coil wire. It is graded correctly at a height of one - half diamond from grade.