[Antennas] Quick Question. I hope.

Wed Nov 1 12:12:12 EST 2006

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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