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Commercial Radio Antennas - Please keep discussion related to professional, commercially used antennas and antenna systems for the two-way radio industry. Topics for the use of these antennas on amateur bands are accepted here.

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Old 07-24-2017, 6:38 PM
KD2DXF's Avatar
  Amateur Radio Operator
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Join Date: Mar 2010
Location: Utica, NY
Posts: 406
Default 5/8 wave antenna kit

I ordered a 5/8th wave over 5/8th wave antenna with the nmo ground plane kit. this will be used as a 10 watt base station antenna. I know how long the vertical antenna is supposed to be cut at, but what about the radials? ive seen a few photos which show really short radials.
Any advise is appreciated. this will be used for 469.550Mhz
Matthew | KD2DXF
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Old 07-24-2017, 7:17 PM
mmckenna's Avatar
Join Date: Jul 2005
Location: WTVLCA01DS0
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1/4 wave length is usually the minimum. At 469.550, you'd be looking at something a bit less than 6 inches.
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Old 07-30-2017, 7:53 PM
Join Date: Feb 2009
Posts: 502

Radial length has no MAXIMUM length

Manufacturers just don't want to use more material than they HAVE to

They need to be at least 10% longer than 1\4 wavelength so in your case it would be 6.5 inches minimum length
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