Discussion in 'Antennas, Feedlines, Towers & Rotors' started by K2POP, Jul 26, 2011.
I second that!
W5INC, thank you for your input. Have you tried a hexbeam? Conor in England (post # 3) says he likes his Cobwebb. I would like to know if they really work as well as some people say. As for a budget - NO. I am just looking for ideas at this point, peoples' favorite antennas. No specific recommendations needed yet. KC9UIY, (post # 8) Can you tell me any more about your Jet stream vertical?
K2POP, I really love my Zero Five 10-40 GP. Relatively speaking, it's a very light vertical and easy to assemble with built-in radial elements. Performance is great for 10-40m and mates well with the Icom 7600. Worked R1ANC on 100w via 20m from Seattle.
I'll add my vote for hexbeam on 30 foot mast. You can load the support mast with tuner and ground system for 40 and 30m. Maybe 80 m if you are not too critical of performance.
The hexbeam will work on 20, 17, 15, 12 and 10m, you can add 6m if you want. It will work almost as good as two element yagi at the same height. You won't always be first through the pileup, but it should work pretty well.
The horizontal polarization will give you some ground gain at these frequencies and the directional pattern will help eliminate QRM and local noise.
K2POP, I always like to look at end user's reviews of a product before I buy. Here is a link to a web page. Scroll down to the hexbeam section and you will see reviews on 7 companies that provide parts or complete Hexbeams for sale. If you look at the rating for these companies and their products it is very high indeed, with nothing but praises for the antenna design itself. With these many happy end users it tells me the antenna indeed does work. Amateur radio OPs tend to be very tough critics, IMO.
To save costs I will buy the base plate from Hexkit and the precut spreaders from Max Gain systems. Max Gain sells all of the wire and other related hardware pieces you need to put it all together. K4KIO has great plans on how to build this antenna on his website and sells complete kits to where most of the work is already down in building the antenna. Either way the hexbeam looks mighty tough to beat for it's size, performance and sustainability in harsh weather if made right.
Yep... they load easily on EVEN and ODD harmonics -- that one characteristic that wavelength loops provide.
Had a 75M loop sloping from 90 ft to 50 ft in the 90's at Keesler AFB, MS. Won Sweepstakes with it two years in a row (Clean Sweeps) with it. The second year, K5TYP, set a Delta Division record because of that loop. Fun times then...
Ran my TS-830S to a Henry 2K Classic X with the HD power supply to the loop (transmission line was 186-ohm balanced line (paralleled RG-62), a 4:1 balun, and a short run of RG-213. It didn't need a tuner on most bands -- a perfect match between the antenna and feedline.
Really fun times for a young man in his twenties...
A "properly installed" dipole is extremely difficult for the vast majority of amateur radio operators to achieve on at least 160-meters, 80/75-meters, and 40-meters because of the height above ground level that is required. On 20-meters and higher frequencies it is MUCH easier to achieve a properly installed dipole. I am only speaking from experience, but my phased verticals on 40-meters run very well with any 40-meter yagi in this area and, in fact, generally outperform any of them where DX is concerned. There is no comparison with those who are running dipoles even at reasonable heights above ground.
During DX Contests, when activity is high, from the Dallas, Texas, area, I can work Europe and Africa, even into western Asia, from a 20 hour to 24 hour time frame. Eastern Asia and Oceania are workable for at least 14 hours and often considerably more. South America is no problem for the entire 24 hours. Even when running each of the 2 verticals that I phase individually, and thus do not have the gain factor, I can run pretty well with any 3-element yagi and, again, there is no comparison with dipoles even in their favored direction. During the winter months, I have started working JA (Japanese) stations from well before midnight local time and have continued to work JA stations until well after noon local time the next day. There are those who state that this is impossible. However, the QSL cards from those stations disagree. The latest, in terms of local time, QSL that I have for an SSB QSO is right at 11:45 AM Dallas time and the latest QSL for CW is pretty close to 1:30 PM Dallas time.
I do use yagis for 20, 15, 12, and 10-meters (I haven't ever gotten around to building a yagi for 17 meters). The HyTower is used on 30-meters and 17-meters and does a respectable job. The separate vertical that I phase with the HyTower is a 40-meter / 30-meter vertical. I definitely have the ability to phase the verticals, vary the direction of the phasing, and to use each antenna separately.
Although NEC does an excellent job of predicting things, it is definitely not perfect. Like any simulation program, you do have to make certain assumptions and that is where most of the misinformation comes from. As a tool for generally predicting things, NEC is excellent. But, it definitely does have limitations.
My actual physical situation is better than at least 95 percent of the operators in the United States. I live basically at the highest point in the city (1/2 block straight west is the highest point) and it is downhill for about 300 degrees and uphill less than 10 feet in elevation and then downhill for the remaining less than 60 degrees. The ground conductivity in this area is considered to be the best in the entire United States! At one time there were no less than 3 commercial antenna ranges near my location: The old Texas Instruments range was about 2-miles straight west, the old Collins Radio range was about 2 miles east southeast, and the still in use ESI range is about 4 miles straight east.
The problem with many vertical installations is that they are a compromise, just like most of the dipole installations. I definitely do not consider my vertical installations "perfect". However, I do use elevated radials and those are considerably better than buried radials.
Basically, I disagree with the statement that "verticals are antennas that radiate equally as poor in all directions". When properly installed, and that is definitely important, a vertical is definitely a very good antenna for working DX. However, for working the more "close in" stations, I definitely agree that a vertical is not as good as a number of different antennas.
I wouldn't disagree with your experience as that is a very individual thing. I have only used 1/4 wave trapped verticals in the past with very poor results. Anyway, you are entitled to your opinion. Thanks for your reply. Best of luck.
Hi, I built Steves version of the Cobweb about a month ago and it works great. Totally ominidirectional, 5 bands and no rotator required. It outperforms my 44ft doublet as far is im concerned. I found nulls in signal a pain with G5RV types.
A hex with rotator would be next on my list if I had the space, but yes the cobweb works and works well.
Trapped verticals are a subject all their own! There are some that perform pretty well and there are those that aren't worth putting together! I definitely stay clear of trapped verticals, all of mine are full sized. Unfortunately, the vast majority of trapped verticals are installed with minimal counterpoises and therein lies most of the problems.
There is a local (to me) operator who lives about 5 blocks from where I lived 40 years ago who has a 40-meter elevated ground plane that is pretty close to 30 feet above ground. He has an excellent signal on 40-meters for DX. Not quite as good as my phased verticals, but pretty darn good! Where he lives it is fairly flat.