[Antennas] Quick Question. I hope.

[Frank]

I am overwhealmed by the amount of technical information.  No, I really 
mean that.  I am not being a smart ass.  I am also convinced that half 
an antenna used inside the house will not work very well regardless of 
how much technical information is applied.

Regards,
Frank Kamp

KD5SFA wrote:
> Again not true.
> I have a colinear dual band vertical at home.
> It's 3 - 5/8ths wave sections and has a ground plane.
> I have a 5/8 over 5/8 wave colinear mobil antenna
> that does need a ground plane. 
> I have a colinear mobile antenna 1/2 wave over 1/2 
> wave and it does not need a ground plane.  I have a 
> 1/2 wave vertical for 10m that does not need a ground 
> plane.  1/2 wave verticals do not need a ground plan...
> They have a matching section.  Odd multiple 1/4 wave
> antenna require a ground plane or the equivilant matching
> section.
>
> 73,
> Jon
> KD5SFA
>
>
>
> -----Original Message-----
>   
>> From: Jim Miller <JimMiller at STL-OnLine.Net>
>> Sent: Nov 1, 2006 12:12 PM
>> To: DavidE Benedict <iam at pmug.org>, antennas at mailman.qth.net
>> 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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>
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