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This is post 2656 in a continuing series of simple ham radio antennas.
Using a metal ground plate simplifies the installation of a ground radial system for your HF vertical antenna.
In this video, David Casler (KE0OG) shows us how to install a ground radial system using a metal ground plate. You can find a commercially-made ground radial plate at "DX Engineering."
Here are some comments from David: