| Author |
Message |
    
larry t
| | Posted on Thursday, July 10, 2003 - 11:59 pm: | 
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just what is a sigma 4 . i saw a picture of one and thought it was different looking could someone cure my curiosity |
RCI 2990
| | Posted on Tuesday, July 15, 2003 - 1:23 am: |
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Whats a Sigma 4? A very good antenna i say!!! I ahve one up on the house roof and use it as a standby but i get great results using it as a stick. I run moonrakers and use it mostly to listen off of.. Good antenna from the mid 1970s classic era!!!! I think its a 7/8 wave antenna but i can get out great all over on it as it is.... |
738
| | Posted on Tuesday, July 15, 2003 - 3:11 pm: |
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In my opinion it's the best Omni ever made! Hope I can find one when the time comes that I can put one up! 2nd would be the old ratshack .64 and currently a 5/8th wave. just my opion ;-)
73 |
RCI 2990
| | Posted on Wednesday, July 16, 2003 - 2:46 am: |
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The sigma 4 and the sigma 5/8 both are awesome antennas that avanti made back in the 1970s... Got both of them here were i live the 5/8 is up in the garage collecting dust and the 4 is up on the roof as a standby!!!!! |
Wolverine
| | Posted on Wednesday, July 16, 2003 - 8:25 am: |
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I owned one between the years 1976 to 1982. My friends would call it the "Upside Down" antenna. I even gave some Moon Raker 4's a run for their money. As far as the gain of the base antenna, I always thought that it was a 5/8 wave antenna. But since being on this forum, I believe the actual gain might be a 6/8 or 7/8 wavelength's. |
mikefromms
| | Posted on Wednesday, July 16, 2003 - 12:05 pm: |
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Maybe some company will build a clone of this antenna. I'm going over to the retrosite and take a look at this thing.
mikefromms |
RCI 2990
| | Posted on Wednesday, July 16, 2003 - 12:31 pm: |
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Whats interesting is i can switch from the upsideown antenna to my rakers and no one notices a thing!!!!!! This is only at a short distance like about 5 to 10 miles.. At a distance yes the change is very considerable between the beam and the sigma 4 like you would find with any beam... |
mikefromms
| | Posted on Wednesday, July 16, 2003 - 7:35 pm: |
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I found a site that states that CTE makes a copy of this Sigma 4 antenna.
mikefromms |
RCI 2990
| | Posted on Thursday, July 17, 2003 - 1:20 am: |
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The CTE version is a good antenna but the craftmanship kinda well, stinks in comparison to the Avanti version i have but the Italian version somewhat is more broadbanded than the Avanti version.. I had problems keeping my italian Sigma 4 together because it used tiny cheap phillips screws that kept vibrating out and the antenna fell apart several times up on the roof!!!! I took it down and pop riveted every other section and used hose clamps on the sections that i didnt pop rivet. It worked great but i sold it when i found a original Avanti... Would i buy another foreign copy? yes but i would beef it up before i put it up!!!!!
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Wolverine
| | Posted on Thursday, July 17, 2003 - 3:00 am: |
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mikefromms, Would you post that address for the cte site that makes a copy of the sigma 4 antenna? I'm feeling nostalgic about my old base antenna, and I would love to take a look at this internet site. By the way, the CB Tricks website has a picture of the sigma 4 antenna. Too bad they don't sell them. |
mikefromms
| | Posted on Thursday, July 17, 2003 - 8:49 pm: |
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http://www.geocities.com/lantinga2000/antenna.html
Wolverine, check out the above site. Pretty interesting. I've never seen a Sigma 4 until I saw one on this site. Looks a little like an Astroplane or least a first cousin to it.
mikefromms |
Tech808
| | Posted on Thursday, July 17, 2003 - 11:04 pm: |
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mikefromms,
At 27' 7" they were tall Antennas. I noticed the Vector 4000 looks just like it.
My post above on July 11th will show you the Original AV-174 Sigma IV and show you the assembly instructions for it.
Lon
Tech808 |
RCI 2990
| | Posted on Friday, July 18, 2003 - 1:15 am: |
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The avanti verison has 3 radials instead of 4 that the 4000 has.. |
mikefromms
| | Posted on Friday, July 18, 2003 - 7:10 am: |
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Wow! |
RCI 2990
| | Posted on Sunday, July 27, 2003 - 8:01 pm: |
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The sigma 4 was not that popular when it was made but it works great! Guys that have them will NOT sell them for nothing me included! I know of only 3 including mine that are here were i am and not one of the guys will sell them. |
