I bought a Petsafe Radio Fence (Deluxe model) for about $190 at Home Depot and 3 more 500' spools of wire at $25 ea. The system is rated for 25 acres. (I have 5 acres, but want to give Charlie 2 1/2 acres).
Now a few weeks ago I had some issues with him bitting and we had our knock down drag out fights (twice), but since then he has done a complete turn around and I think things will be fine. One of the things I did and didn't waist any time with was installing this remote fencing. Although it is designed to go underground, it doesn't have to be. I talked with the people about weaving the wire or attaching it to the "T" posts along the bottom fence wire and they said it would work great as long as the wire was not higher than his collar as it was for some reason it works better if the signal is closer to ground level.
I have to admit that this system has been a godsend. I can now let Charlie roam the yard while I'm out there. Were before I had to keep him tide up while I was working around the house which I thing he thought he was getting punished. He has room to roam and play and I'm no longer the bad guy for telling him "NO" when he tries to leave the yard on the leash or chasing him down when he's escaped the yard.
The system has been in place for little over 10days now and I finding that I can let him out and he will go do his business and return without me. When he does try out the fence, he returns to the back porch (its his safe domain). I have it set to sound off at 6' and correction at 5' from the wire (less chance of run through). You can set it for as much as 10' of correction distance.
I highly recommend this system for anyone that wants to keep their pets home where they belong and can't for whatever reason put up a chain link or privacy fence.
I have noticed such a change in Charlie that I don't think I ever will have another pet without one of these sytems in place.