[Antennas] Quick Question. I hope.

Wed Nov 1 12:57:00 EST 2006

Hi
 According to my understanding, quarter wave and half wave end fed 
antennas shouldn't need a ground plain. However, most antennas have a better 
Q. if you use a ground plain.
 God bless,
 Mark WZ0K
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----- Original Message ----- 
From: "Jim Miller" <JimMiller at STL-OnLine.Net>
To: "DavidE Benedict" <iam at pmug.org>; <antennas at mailman.qth.net>
Sent: Wednesday, November 01, 2006 9:12 AM
Subject: Re: RE: [Antennas] Quick Question. I hope.
> NOT true. ONLY "Collinear" antennas do not need a ground plane. ALL 
> other
> mobile antennas or verticals require a ground plane. I think you have 
> just
> realized your SWR problem. Provide the ground plane and you should have 
> the
> SWR come in. The ground plane (at least for test purposes) can be simply 
> 3
> or 4 wires of 19 inch length connected at the feed point to the shield 
> side
> of the coax.
>> 73, Jim
>> ----- Original Message ----- 
> From: "DavidE Benedict" <iam at pmug.org>
> To: <antennas at mailman.qth.net>
> Sent: Wednesday, November 01, 2006 10:31 AM
> Subject: Re: RE: [Antennas] Quick Question. I hope.
>>> CBoone at earthlink.net writes:
>>Indoor antennas are always a pain....especially for 6m....2 should be easy
>>to do BUT remember, an indoor antenna has a 12db loss compared to the same
>>antenna outside!! 12db is a 20:1 power level.....IF you can run a single
>>coax outside, try putting a 5/8wave antenna on a good ground plane (54in
>>radials)....that will work on both 2 and 6mtrs and the higher the
>>better...even a small RG58 run can be done through most windows
>>thresholds...
>>Likely you have some metal in the vicinity of the indoor antennas....or
>>the
>>ground plane is not sufficient...
>>>>Chris
>>WB5ITT
>>(also running a 857D on 6 and 2 using a NMO150 on top of the company van
>>;)
>>> Hmmmm...where does that 12db loss come from just by being indoors?
> ...doesn't sound right.
>> My understanding is that 5/8 wave ant does not need radials or 
> groundplane.
>> David B.
> W7DBH -Mobile Only
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