I don't understand why there are wires and such under the dirt in such a tall fence? I think the most obvious solution is to dig a trench all the way around, so when he stands up there and peeks out, he can't get up high enough to jump out.
Unless he can do a running leap. Some dogs can jump over everything and anything. But it is my experience that the dogs that don't think that way are easily foiled by just a couple inches of extra fence. There's a 2 inch high ridge in my driveway, and one of my son's dogs took a look at the fence (the exact same height all long the driveway) from that vantage point, and realized he could make it. So he did. I saw him do it. He could easily jump over every part of the fence, but I only block off that little corridor temporarily when he comes over, and he's never gone over the fence since.
I put a rabbit fence up around some gardening. It was about 2 feet high. My terrier mix flew right over it, but the Golden Retriever mix is totally flummoxed. Until she bumped into it hard and knocked it down a little--then she went over it *there* with no problem. As soon as I fixed that spot, she was stuck again. It's quite hilarious.
I hope your doggie doesn't get out again. Around here it's a $50 ticket.
Karen