[Antennas] 1/4 vertical vs. vertical dipole

Wed Aug 25 15:30:24 EDT 2004

Thanks, That was great reading! I am looking into them now.
Buck
N4PGW
-----Original Message-----
From: John Tait [mailto:bravo at iol.ie] 
Sent: Wednesday, August 25, 2004 1:05 PM
To: Christopher Boone; antennas at mailman.qth.net
Subject: Re: [Antennas] 1/4 vertical vs. vertical dipole
Subject: Re: [Antennas] 1/4 vertical vs. vertical dipole
Variations on this theme at http://www.iol.ie/~bravo/low_band_antennae.htm
 73
 John EI7BA
> Ground plane takes less VERTICAL real estate..GP requires more metal on
the plane area for proper operation.....other than that, not much difference
(well the dipole will be 60-75 ohms depending on height..also the coax must
be run 90deg away from it for a 1/4wave if possible to keep the radiation
from getting back into the feedline and allow the dipole to keep a proper
"doughnut" pattern of radiation..
>> Remember the bottom of a vertical dipole must be isolated and kept away
from other metallic objects to keep the radiation pattern clean....a GP
antenna can have metal below the vertical element.....due to the ground
plane effect...
>> Chris
> WB5ITT
>> -----Original Message-----
> >From: Buck <na4fm-list at towncorp.net>
> Sent: Aug 24, 2004 3:57 PM
> To: antennas at mailman.qth.net
> Subject: [Antennas] 1/4 vertical vs. vertical dipole
>> Would some of you be so kind as the pros and cons between the vertical
> quarter wave ground plane and the half wave vertical dipole?
>> Thanks
> Buck

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