putting the dual band antenna above the HF antenna  certainly is a much
better idea...the hf antenna would then act as a sort of ground plain...if
you run it in a dipole configuration that is.
even without an electrical connection to the ground portion of the dual band
antenna, the extra horrizontal antenna below it would help a little.

You might also consider a dual band dipole for VHF/UHF...they would be
fairly easy to build...a half wave dipole should work well on both
bands...this can be run in a horizontal configuration above the HF antenna.
If you run it a foot or so further up the pole you should be fine.
You can run the 2m/70CM dipole in an inverted V shape to make it omni
directional instead of having to rotate it to the station your listening to.
just be sure that the ends of the V are a ways above the hf antenna to keep
a good SWR on the dual band antenna.  Something this small shouldn't affect
the swr on your HF antenna a great deal.
There are allot of different options here.
73
Colin, V A6BKX
----- Original Message -----
From: "John Miller" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, July 10, 2005 2:43 PM
Subject: Re: suggestions needed for simple and quick mount 2-meter/440
antenna


> you're right, it is ground independent, I used it on a plastic car and it
> worked as well as my base setup believe it or not. I'd still think the
> distance from the HF antenna to the duel bander would be a problem, but is
> there any way you can get it over the HF antenna? on the same mast? I'd
> think that would be better than under it though if you're clear by a lot
it
> might not be too bad but when we put the bike on the bikerack on the back
of
> the car it was about 2 feet from my antenna on the back of the car, it
> changed things a little but it was still useable.
> ----- Original Message -----
> From: "Tom Behler" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Sunday, July 10, 2005 4:12 PM
> Subject: Re: suggestions needed for simple and quick mount 2-meter/440
> antenna
>
>
>     My understanding is that the Diamond 770 is "ground independent",
which
> is why I was thinking of it.  It works well on our vehicle, using a
magmount
> base which, of course, isn't an option here.
>
> The real challenge is figuring out how to mount it safely.  I have found
> that R and L Electronics has some sort of an RV mounting kit, which I'm
> going to call about tomorrow.
>
> And, again, does anyone see a problem if I were to mount something like
the
> Diamond 770 underneeth the painter's pole being used for the HF dipole?
>
> Best 73 from Tom Behler: KB8TYJ
>
> ----- Original Message -----
> From: "Louis Kim Kline" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Sunday, July 10, 2005 2:31 PM
> Subject: Re: suggestions needed for simple and quick mount 2-meter/440
> antenna
>
>
> > The problem with a 5/8 wave antenna is that it will not work well if
there
> > isn't a good ground plane under it, and it sounded from Tom's message
like
> > there might not be.  I think that ground independent antenna designs are
> > the way to go for this application.
> >
> > 73, de Lou K2LKK
> >
>