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1 vote
1 answer
417 views

Antenna conterpoise or ground plane. Confused about length requirements

I have an appliation where i need to mount a multiband (VHF/UHF/700/800/900 MHZ) mobile antenna (picture 2) on a tower. The spec sheet for the antenna says it used a 4 foot diameter ground plane for ...
Frank's user avatar
  • 325
19 votes
4 answers
18k views

Why does 1/4 wavelength have a ground plane and 1/2 wavelength needs none?

Why does 1/4 wavelength have to have a ground plane and 1/2 doesn't? I know that an antenna that has half a wavelength does not need the ground plane (example a dipole antenna) and when using a ...
LUFER's user avatar
  • 469