Window Screen Ground Plane Test.
If you need an easy-to-install ground system for your 1/4 wave vertical HF antenna, try this intriguing idea from "Classic Clay Presents" (KO4MEX),
Rather than using long lengths of wire, this ground system consists of a large window screen--something you can find at a hardware store or building supply outlet. You roll up the screen and store it in your vehicle before going to the field for your next portable operation.
According to this video, the window screen ground plane works well enough to make it a valuable antenna accessory.
If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=Kf3NOQQwYtU
Here are some notes from the video: