Not sure yet. It's 20 x 30 ft so would take alot of fish line to cover. Probably will start with bird net and maybe part shade cloth. Half of the yard is under trees so gets shade until late in the day. I know it will get covered with leaves this fall so want something that is cheap to replace. Also thought of chicken wire then take a leaf blower and blow the leaves off from underneath. But for now gonna go cheap. Will probably have some type of simple PVC frame to keep it from sagging. Only two of my big birds and two of the bantam can make it over the 4ft. Once the 6ft is up I think the only one that might still get over would be the sebright she is a good flyer.What are you using to cover the area with to keep the chickens from flying over the 6ft fence? I've been thinking about making an enclosed area for specialty breeds.