less then 2 to 1 on all bands is a good thing.
A decent tuner will do that with any chunk of wire really.
You could put a 25 foot  chunk of wire around your ham shack floor in an
underground bunker, and with an external tuner   get less then 2 to 1 on any
band....

The issue is that the antenna will not be efficient, and will not be
radiating properly except on the band it was specifically designed for.
You can tune the heck out of a 20 meter dipole and get an swr of less then 2
to 1 on 160 meters, but it isn't going to work.  A tuner fools the radio
into thinking that it has a 50 ohm load on it, and also fools the swr meter
into thinking the same thing.  It doesn't suddenly make your antenna
efficient or allow it to radiate well on the band it isn't cut for.
A standard understanding with antennas is that you can use an antenna on the
frequency it is cut for, and tune it for frequencies with shorter wave
lengths and it will still be relatively efficient on those other bands.  But
it doesn't work for frequencies with longer wave lengths.

Most guys who use a dipole and say they can use it on any band, are using
fairly long dipoles, usually around a half wave on 75meters, or longer.
That way, they are always tuning for frequencies that have a shorter wave
length then the antenna is designed for.

hope this isn't too confusing.
Basically, your 20 meter dipole shouldn't need any tuning via a tuner on 20
meters, and should work fine with the use of a tuner on 17, 15, 12  and 10.

Remember also, that a dipole doesn't start becoming efficient until it is at
least a half wave above ground.
For 20 meters this is a bit over 30 feet.
73
Colin, V A6BKX
----- Original Message ----- 
From: "Gery Gaubert" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, August 24, 2007 9:38 AM
Subject: dipole antenna verses vertical and use of a tuner


> Ok, not sure who wrote it but they said a dipole shouldn't limit you to =
> just 1 band.  This brings up a situation that happened to me the other =
> night.  I have a tuner and the dipole.  I got everthing set up and then =
> used th ldg z100 tuner.  I then got less than 2.0 on all bands.  Could =
> tis be true or could something be wrong with my meter or tuner?
>
>
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