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Edit: After consideration.. Certainly wasnt intended to irriate you or make things more complicated. Therefor ill remove the post as that will make things less complicated. Ill try to keep it into future consideration, though i do get carried away into detail every now and then, hope u can...

Removed in order to make things less complicated.

For what reason did you use an online calculator instead of the factory dimensions ? As from stock its not a bad performer . https://cb-antennas.com/shoot-out/sirio-sy-3/

Keep asking with whatever is confusing you. It most likely is my bad explination, Im trying to learn about antennas everyday...so I take some things for granted....which obviously they are not always good to get things right ! Lambda is the same as wavelength. (Or I believe it is the word for...

Im afraid that has litlle use, but it is a good way to start a myth... :-) First thing would be the velocity factor: - The common mode currents run on the outside of the coax. THERE IS (besides some material loss) NO VELOCITY factor. Secondly, the ideal distance of the Choke depends...on the...

If I understood what you said correctly, the only way that the Chicom 1/2 wave can "get away" with using three 30 inch radials is by also using the mast and coax as part of the ground plane. That also allows it to "cheat" the antenna in to thinking it's 50 ohms. Is that correct? If I were to...

hello, Radials is a story on its own. To all your questions, the short answer is yes. The longer anwer would be something like: All vertical endfed antennas need some type of "radials". Though for some the demand for it is higher then others. Again: ALL vertical end-fed type antennas needs...

That is the hunt we are all after..a smaller (mobile) antenna that works as a bigger one. Im afraid that is not possible. Your magmount option would be the best (performance) option. Kind regards, Henry

Although still under construction..but maybe it gives a couple hints: https://cb-antennas.com/additional-information/the-influence-of-mast-and-coax/ At the bottom of the page youll find an end-fed halve wave at 8.25m with antenna plots and current. I still need to do quite some work on that...

Hello Roger, You are more then welcome ! There are several ways to measure the POWR dB loss. You could measure your power output which goes into the coax and on the other end and calculate it from that. (though most SWR/POWER meters lack accuracy) For field use i tend to stick with my...

Hello Roger, I dont know if you work a lot of "locals", in that case the vertical indeed needs to be as high as possible. But if you work mostly "skip". In that case you could place the vertical just almost "on the ground" that wont make a hugh difference. We could look into that further..if of...

Hello, That sirio has 8,1 dBi gain: Sirio SY 4 The Maco has 8,67 dBi gain: MACO 104C Logical, as the Maco has about 25 percent more boomlength over the Sirio and gain comes from boomlength. The advertised gain of both lack accuracy. Maco speaks of 14dB and Sirio of 13,15 dBi... That is just...

Thats what it is all about ! Fantastic to hear about your experience ...keep it going ! You might want to check on 27,555 USB which is the "international" DX calling frequency. Im confident you should be able to get into Europa and africa etc. And for sure a beam will open a new world for...

Hello John, Yes...that is correct. That is called the elevation pattern and is viewed from the side. The pattern you see when looked from above is called the "azimuth" pattern. You can read a bit more about those plots here: https://cb-antennas.com/?page_id=856 Kind regards, Henry

Hello John, To answer your question: The difference between 90 and 45 degree angle of the radials with a quater wave groundplane is neglible. Here is the expected antenna pattern for a groundplane say 33 feet above ground (average ground conditions) Black is with a 45 degree angle and blue in...

Hello, Possibly there are situations where it isnt always true that the higher we place the vertical antenna...the lower your take-off angle will be. Specifically not, if you have relative good ground around you. That ground actually playes a significant part. (it is open to debate what would...

Hello DB, Good to see you have got it up and running. You still need to worry about the average gain factor though it wont be an issue as often. I assume you are referring to that not commonly used "moderate ground" ? I did an analyse on the G-max: Which can be found here: (Click) Grazioli...

Thanks ! https://cb-antennas.com/?page_id=825 There is a pdf with pictures and details. The antenna is still up and running for several years now.

Some Sunday afternoon fun on an old superstar 7000 DX. Mr Darren on Solomon island(s). (Antenna the double extended zepp)

Yup...that is as it is... Im glad you changed your mind ;-) Kind regards, Henry