My neighbor has a vineyard. We had an existing barbed wire fence and when he put the vineyard in he placed an 8 foot fence outside of the barbed wire fence. Although I've never witnessed it happen, my neighbor claims that deer still occasionally jump the double fences but it has significantly cut down the deer presence on his property.

Personally I like the deer and I've named them, let's see there is Al Coholic, Barb Dwyer, Dwaine Pipe, Marsha Mellow, Marty Graw.....

JHAP
~~~~~~~~~~
"My mind is a raging torrent, flooded with rivulets of thought cascading into a waterfall of creative alternatives."
...Hedley Lamarr (that's Hedley not Hedy)