Yes, monofilament fishing line may be strung between 10-foot posts, the strands about two feet apart. This may be one of the least expensive deer fences to construct. However, if this is your choice, be sure to tie streamers to the strands so the deer will see your fence. Use several colors, as deer do not see some colors very well. Less expensive is a double or triple strand electric fence.
Place strands about two to three feet off the ground and about four feet apart.
The deer may jump one fence but often refuse to, or can't, jump both. Your best bet is a triple system, with the two strands as above and another in between but about five to six feet high. This forms a fairly impenetrable triangle, and while not too high for deer to jump, they can't clear all strands considering the width. Some people have had good luck with only one strand of electric wire, baited with peanut butter. If you use guns or bow and arrows, be sure to follow all safety precautions, local ordinances, and state laws concerning hunting.