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Commercial Radio Antennas - Please keep discussion related to professional, commercially used antennas and antenna systems for the two-way radio industry. Topics for the use of these antennas on amateur bands are accepted here.

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  #1 (permalink)  
Old 07-23-2017, 1:10 PM
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Default Looking for a Dual Band Mobile NMO VHF/UHF Ham&Public Safety Freq.

I am looking for a Dual Band Mobile NMO mount VHF/UHF with Ham and Public Safety frequencies for both the UHF and VHF. I don't transmit a lot on the Public Safety but once and a while I will need to.

I have an NMO mount: I need 2 antennas. One will be mounted on hood edge with a multi axis mount (so antenna won't have a lot of ground plane.)
2nd will be on roof at first with a Magnet Mount. I have a leased vehicle and don't want to put a hole through so still working on another option for that antenna to mount but will use a magnet mount to start with.

Any help ideas that can be provided would be great!!!!!!

Preferred for UHF: 380 to 490 or so. Acceptable 440 to 490.
VHF 140 - 174+

Thanks,
Nick
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Old 07-23-2017, 3:56 PM
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1/4 wave antennas are very broad banded and work well in this sort of application. It does require a separate VHF and UHF antenna to do it right.

There are dual band commercial antennas, but not sure they'd have the bandwidth you need. Larsen, Laird, etc. make a few that will work.

Having done things like this before, I can tell you that a good option is to use a diplexer (this is a dual band radio, right?) and use a VHF 1/4 wave whip tuned for center of the band and a separate 1/4 wave UHF whip tuned for the center of that band.

There are some amateur radio grade dual band antennas that will do this, but if you are using this for public safety use, get the right stuff. It'll last longer.
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Old 07-24-2017, 7:34 PM
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Agreed about the commercial/public safety antennas. Will outlast any ham-grade antenna.

But, Comet made a "search and rescue" antenna at one time that covered 2m and 70cm ham as well as traditional public safety bands.
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Old 07-24-2017, 8:03 PM
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Comet Original CA-2X4SR (PL259) CA-2x4SRNMO (NMO) 140-160 / 435-465 MHz Dual Band Amateur Mobile Antenna
For search and rescue. Still available.
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Old 07-24-2017, 10:59 PM
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I almost bought a CA-2x4SRNMO and someone here on RR contacted me and said they didn't work very well.
prcguy

Quote:
Originally Posted by sdu219 View Post
Comet Original CA-2X4SR (PL259) CA-2x4SRNMO (NMO) 140-160 / 435-465 MHz Dual Band Amateur Mobile Antenna
For search and rescue. Still available.
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Old 07-24-2017, 11:17 PM
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Quote:
Originally Posted by prcguy View Post
I almost bought a CA-2x4SRNMO and someone here on RR contacted me and said they didn't work very well.
prcguy
Ripped mine out of my roof when I hit a tree branch. Now they have a spring but at the time there wasn't one available.

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Old 07-24-2017, 11:48 PM
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Check out comtelco. They have some 1/4 wave models that cover 20-30Mhz.

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Old 07-25-2017, 1:20 PM
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Quote:
Originally Posted by bidulock View Post
Check out comtelco. They have some 1/4 wave models that cover 20-30Mhz.
It may be a nice antenna, but not very useful for the OP's purposed VHF/UHF needs...
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Old 07-25-2017, 7:26 PM
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Quote:
Originally Posted by N4GIX View Post
It may be a nice antenna, but not very useful for the OP's purposed VHF/UHF needs...
May be referring to the bandwidth of one of the VHF or UHF one quarter wave antenna with the large diameter rod. I have one with a 3/16 dia rod.
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Old 07-25-2017, 10:31 PM
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Quote:
Originally Posted by MCore25 View Post
Ripped mine out of my roof when I hit a tree branch. Now they have a spring but at the time there wasn't one available.

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I liked the antenna, but damaged the roof of my Jeep. It covered the frequency range well, but get the spring version.

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Old 07-25-2017, 11:15 PM
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Default Comtelco

I'll second the suggestion for these, great bandwidth on vhf/uhf. I've used them for years. You can purchase these muiltiband mobiles from rfwiz.
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Old 07-27-2017, 10:53 PM
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Quote:
Originally Posted by prcguy View Post
I almost bought a CA-2x4SRNMO and someone here on RR contacted me and said they didn't work very well.
prcguy
I have 2 of these and find they are one of the best antennas I have used. Cannot comment on transmit outside amateur frequencies but they are certainly excellent at receiving outside and inside amateur bands. In fact, I use them more than a Larsen antenna that lot of people rave about but I find sub par. And unlike rules about transmitting with an amateur radio outside amateur bands, there is no regulation about using antennas. But always check SWR or other antenna characteristics for frequency being used.
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