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Low profile uhf Antennas

This forum is dedicated to helping people with questions about installing radio equipment in vehicles. This can include antenna installs, electrical wiring questions/problems, and mounting systems. Pictures of installs are welcome.

Note: Discussions regarding lighting, sirens, and other equipment now has its own forum in the 'off-topic' section below.

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smills1
New User
Posts: 4
Joined: Tue Oct 21, 2008 7:14 am
What radios do you own?: M100, MTS2000, SM50

Low profile uhf Antennas

Postby smills1 » Sun Nov 16, 2014 3:35 pm

I am looking to purchase a low profile Uhf mobile antenna. My first choice is the laird Phantom Elite but came across the Browning Tram BR2445 as a possible one also. Specs show the Laird at 3.0 dbi and the Browning at 2.4 dbi. I am looking for feedback from anyone who has used either of these antennas and am wondering how much of a difference in practical operation is 2.4dbi vs 3.0dbi.
Thanks
Steve

Will
Posts: 6823
Joined: Tue Sep 04, 2001 4:00 pm

Re: Low profile uhf Antennas

Postby Will » Mon Nov 17, 2014 10:30 am

First, 3dBi is no gain, as the isotropic reference is already 2.8 dB below dBd the dipole reference.

Just get a Motorola NMO mount and 1/4 wave whip. If you need a low profile cut the ball off the whip.

User avatar
Bill_G
Posts: 3055
Joined: Thu Sep 17, 2009 5:00 am

Re: Low profile uhf Antennas

Postby Bill_G » Mon Nov 17, 2014 12:24 pm

A discussion on dbi vs dbd.

A plain old quarter wave exhibits 2.15dbi gain. So, both of the low profile antennas have very little additional gain compared to a quarter wave. The difference between the two antennas is also negligible. You should not notice a performance difference between any of them.

smills1
New User
Posts: 4
Joined: Tue Oct 21, 2008 7:14 am
What radios do you own?: M100, MTS2000, SM50

Re: Low profile uhf Antennas

Postby smills1 » Sat Nov 22, 2014 5:18 pm

Thanks for the information and explanation- I now have a simple quarterwave whip and am very pleased with the results.

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nukedude
Posts: 59
Joined: Fri Apr 16, 2010 9:40 am
What radios do you own?: Many Motorola's

Re: Low profile uhf Antennas

Postby nukedude » Fri Dec 05, 2014 2:35 pm

For 450-470 MHz, I have used the older Antennex UHF Phantom antenna, what is now badged as a Laird.
It has worked well for 5 years now on a trunk lip mounted NMO on the right edge of my trunk. This has given it a reasonable amount of metal for a ground plane.
The Laird VHF "whisker" antenna did not fair so well. It corroded over time, the Phantom one has barely even faded from the original black color. "Antennex" has faded off of the plastic though.
So for UHF the Phantom style antennas seem to work well. (The old VHF "soup can" looking ones did not, they only had 1MHz bandwidth.)

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NSPD
Posts: 1587
Joined: Sun Aug 04, 2002 4:52 pm
What radios do you own?: Motorola FR50!

Re: Low profile uhf Antennas

Postby NSPD » Tue Dec 09, 2014 6:03 am

I've been using a 450-470 Phantom Elite "Sharkfin" for some time now, works great.
Jake

N4KVE
Posts: 1582
Joined: Wed Apr 02, 2003 10:35 am
What radios do you own?: XTS3000/5000, TRBO, 900MHZ

Re: Low profile uhf Antennas

Postby N4KVE » Wed Dec 10, 2014 7:27 am

nukedude wrote:For 450-470 MHz, I have used the older Antennex UHF Phantom antenna, what is now badged as a Laird.
I use the same Antennex antenna. Works great, & is mounted in the center of my trunk lid. GARY


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