My set-up is virtually the same as Trevor's and works very well for visual.
I use 3 sections of portable sheep-yard (1.5m x 2.4m) that are designed to link together with pins. They are quite light, around 10kg each and have little processes on the uprights that allow you to push them into the ground. If interested, go to e-bay and type in "portable sheep yards". They were made by a bloke in Geelong and cost around $90 each.
Believe me - that's dirt cheap for a sheepyard!.
Once situated, I cover the sections with some HD nylon tarp that I've nipped and tucked to fit with extra holes/grommets. I use cable ties to attach the tarp as they are very strong and, again, dirt-cheap.
The whole rig takes me about 15 minutes to erect and a little longer to take down.
I'd post a pic but the panels are actually doing duty keeping in sheep ATM.
