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Author Topic: Wide Bandwidth Dual Band Mobile Antenna?  (Read 1603 times)
MSPJ
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Posts: 64




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« on: April 09, 2008, 08:37:16 AM »

Hi - I'm looking for a low profile dual band mobile antenna.  I'd like it to have decent performance into the GMRS band (462-467), and if possible MURS (151-154).

I was looking at the Larsen dual bands. Interestingly, the bandwidth on the small one (2/70SH) seems to be much higher - 10% vs about 3% on the 35" model.  When you do the calculations, the SH definitely covers these other bands at 1.5 SWR, whereas the 2/70B does not.

Has anyone had any experience using either of the Larsen's with GMRS or MURS?

THere are no separate reviews of the SH version, but one reviewer of the larger version referred to the Larsen 'mini 17"' dual band as being the only Larsen antenna he thought was not good.  I'm guessing he meant the 2/70SH, although the specs say 19".

Do people like the short Larsen for either amateur or the other bands?  I'd be using it on a trunk lip/hatchback mount.

Thanks
Michael
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K0BG
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« Reply #1 on: April 09, 2008, 09:31:12 AM »

Low profile doesn't necessarily go hand in hand with bandwidth. There are what's called railroad antennas, which have radiators about 2.5 inches in diameter. They have a very wide bandwidth, but they sure aren't low profile.

The best thing is to use 1/4 wave for each of the band segments you want to cover. This should be easy enough, as separate radios are required GMRS, etc. Meaning, you can use amateur gear to cover all the bases. That's illegal.

Alan, KØBG
www.k0bg.com
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MSPJ
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« Reply #2 on: April 09, 2008, 10:45:47 AM »

Hi - Yup, I'm aware of the requirement for separate radios, and will switch off as necessary.  The issue is that I'm trying to not have a whole raft of antennas on my car, nor do I want to use mag mounts and keep swapping them or have a rats nest of coax coming through the windows.  Easy enough to use BNC adapters and switch the antenna from one radio to another.

So - if I can find a 2/70 antenna that will be acceptable on other bands, that will be a good compromise.  I have done okay with my current MFJ through the glass model (old car), but I'll be changing cars and newer car probably won't work as well through glass due to all the changes in auto glass in the last several years.

Michael
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MSPJ
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« Reply #3 on: April 09, 2008, 10:48:01 AM »

Oh yes, I also understand that low profile doesn't mean high bandwidth - the point was that I'm trying to find both, if possible.

I actually have been in touch with Larsen and they confirmed that the SH model (17") does have a wider bandwidth, and will perform reasonably well at these other bands. (SWR definitely less than 2, and probably less than 1.5)
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K0BG
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« Reply #4 on: April 09, 2008, 11:42:02 AM »

Do a search for Antenna Specialists number ASP-574 Series. It might fit your needs.

Alan, KØBG
www.k0bg.com
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KC7YSF
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« Reply #5 on: April 10, 2008, 10:54:55 PM »

Another antenna you might consider is the Super M by Nil-Jon.  You can read more about them at www.niljon.com

Scanner buffs like this antenna for its wide coverage ability.  It is an unusual design, but it might work for you.
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KB2VUQ
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« Reply #6 on: April 19, 2008, 07:43:12 PM »

Maxrad MDB1444S

Actually works well into the 160's and 470's...receives
fairly well on the aircraft band, too.

Link here......
http://www.maxrad.com/product_overview_detail.cgi?id_num=10946
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