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Note: That title is not mine, but the heading of this item in RADIO HANDBOOK by Wm. I. Orr, W6SAI, 20th Edition, page 27.15
The ground termination for an unbalanced antenna system can be improved by the addition of a radial ground wire which is connected in parallel with the regular ground connection. The radial wire consists simply of a quarter wavelength of insulated wire connected to the ground terminal of the transmitter. The opposite end of the radial wire is left disconnected, or “floating.” The radial wire may be run about the baseboard of the operating room or out the window and a foot or two above the ground. A high-impedance point is reached at the end of the wire and a corresponding low impedance (ground) point at the transmitter end which simulates a ground connection. While it may be used by itself as a ground termination, the radial ground wire works best when used in combination with a regular ground connection.