Gee I am gong to have to learn those state abbreviations... So many of
them start with "M" grin

I use to work on UHF radio equipment installs being used on the flat
areas in western NSW (Australia). One of the common setups was a 9dB
fibreglass whip (476MHz - about 6ft long). It had to be setup just right
otherwise the few degrees of tilt you got from air movement would lift
the pattern in front of the vehicle above the horizon and make it all
but useless.

I also hear that 1/4 wave whips are almost essential if you are driving
amongst high rise buildings.

Also did some tests recently on the "gain" of a vehicle mounted 1/4 wave
vs a test dipole antenna at 4 metres height. There was about 10dB
between them, we assumed because the 1/4 wave was still very much in the
ground clutter. This was on 149MHz and LOS.

My view is that any dual band antenna is going to be a huge compromise
anyway and high gain on both bands unlikely. I am however prepared to be
shot down over this!

Apologies for waffling on!

Bob VK2YQA

C. J. Clegg wrote:
On Wed, 02 Mar 2005 06:40:53 +1100, Bob Bob
wrote:


- You live in very flat country?


Not particularly flat ... (MA)

On Tue, 01 Mar 2005 13:40:45 -0500, C. J. Clegg
wrotF:


Looking for the very best 2M/440 dual-band mobile antenna made.
Looking primarily for the highest gain on both bands. Mounting and
size (length) are not important, i.e. can be anything.

Any suggestions?

Thanks...
I'm using the Comet CA-2x4SR . It seems to work quite well on 70cm
and about the same as 5/8 wave on 2m. I had originally tried a
Jetstream JT7905L and it actually seemed a little better on 2m and
70cm receive, but the swr was higher than I liked on the high end of
70cm where the local repeater inputs are .

I've had two dual band mobile Comets that seem to get water logged in
the loading coil. It seems to loose gain especiually on 2 meters after
about 1 year on the car. The coil is well sealed so I think it is a
condensation problem. I have drilled a small hole in this last one to
let the water vapor OUT and it seems to have solved the problem.

Mark

Hi,

I have had good luck with the Larsen 2/440 with the NMO mount.

Good luck,

Doug W3IIY

C. J. Clegg wrote:
Looking for the very best 2M/440 dual-band mobile antenna made.
Looking primarily for the highest gain on both bands. Mounting and
size (length) are not important, i.e. can be anything.

Any suggestions?

Thanks...

On Tue, 01 Mar 2005 13:40:45 -0500, C.J.Clegg wrote:


Looking for the very best 2M/440 dual-band mobile antenna made.
Looking primarily for the highest gain on both bands. Mounting and
size (length) are not important, i.e. can be anything.

Any suggestions?

Thanks...

Larsen NMO2/70B or NMO2/70C in years of mobile operation no other
mobile antenna has delivered the day after day performance these antennas
have.