Military Russian Umbrella Antenna

digitalanalog

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Joined
May 18, 2007
Messages
555
Location
Nunya,USA
been looking at this on eBay.
I have looked around and yes GOOGLED Umbrella antenna but don't see anything to answer my question.

What is missing from the TOP of this antenna, There is a threaded rod section at the top so something is missing, a Disc? a WhiP?

eBay Link

ebayumbrellaantenna.jpg
 

a417

!#
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Mar 14, 2004
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1,710
It is a discone minus the disc. Won't work without it.
Fascinating...didn't know a discone could have the cone elements attached to the trunk/mast like that, what do you think that does to performance/bandwidth over having them w/o the horizontal attachment?

Interesting. I am curious if that disk is something that could be easily fabricated?
As @ko6jw_2 confirmed it's a discone, there are many easy ways to create that top disc that I see. round flat metal disc , small circular baseplate w/ metal radials, etc...
 

WA4A

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Apr 21, 2016
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Burlington, NC
The discone is just a modified wide-band half-wave vertical dipole antenna. The skirt (cone) is a quarter wave long at the lowest frequency and the top hat (disc) is the other half. Typical frequency range for military discones are 225 to 400 mHz ( military aircraft band). The gain is less than one, so don't expect any great DX with this one!
 

prcguy

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Joined
Jun 30, 2006
Messages
10,008
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So Cal - Richardson, TX - Tewksbury, MA
No, a Discone is related to a Bicone antenna, which is related to a V beam or horn antenna, which are all considered aperture antennas. A Discone launches a vertically polarized wave from the aperture formed by the intersection of the disc and cone.


The discone is just a modified wide-band half-wave vertical dipole antenna. The skirt (cone) is a quarter wave long at the lowest frequency and the top hat (disc) is the other half. Typical frequency range for military discones are 225 to 400 mHz ( military aircraft band). The gain is less than one, so don't expect any great DX with this one!
 
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