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Old 12-28-2017, 1:07 AM
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The 5% or 10% longer for ground radials is an old myth, they should be 1/4 wavelength resonant if possible. That provides an exact 1/2 wavelength round trip from the feedpoint to the end of the ground radial and back to the feedpoint, mimicking the feedpoint impedance.
prcguy



Quote:
Originally Posted by MOTEX View Post
For VHF, you will need at least 20 inches of ground plane in all directions since ground planes must be at least 10% larger than 1\4
wavelength.
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