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What kind of gain do the Signal Sticks have?

Questions about antenna gain

Probably the question I get asked most is “what kind of gain do the signal sticks have”, and “why don’t you list gain on the site?”  I have answered many people individually, but it comes up often enough that I figured I should probably write up an explanation.

First and foremost, the reason I don’t list the gain of the antenna is that I don’t like to lie to people. I consider it dishonest to give a number which can’t be proven in actual use. Here is the problem with “gain”: gain is a relative term. Literally.  Gain is defined as “increase the amount or rate of (something, typically weight or speed)” — in this case, it would be an increase in output, signal strength, etc.  Here is the issue, though: it has to be relative to something.

When you transmit, you put out a certain amount of power — if it’s a handheld, that might be 5 watts.  If you have an “ideal antenna” then those 5 watts will go out from the radio and nothing will be reflected back to the radio (in a simplified way, this is what SWR is: how much power was radiated vs reflected). However, if you had a theoretically ideal antenna you could have another theoretically ideal antenna which outperformed it in certain cases.  This is because there are actually two things to worry about: 1) the power of the radiated signal, and 2) the direction of the radiated signal.

Some antennas will tell you that they are 3dB gain — this means they will have twice the signal strength of some other antenna. If you see 3dB then you should find out what that is in relationship to.  I can confidently tell you that you should get *at least* 15dB gain using my antennas…. compared to using a dummy load.

Finally, a “rubber duck” antenna is able to be short because it makes up for it’s short length by adding a “load” to the antenna — typically a coil at the base which loses some energy to heat in exchange for making the rest of the antenna resonant at the frequency you need.  It also changes the radiation pattern, though; in general, only a very very poorly designed “whip” antenna would fail to outperform the rubber duck, but remember that radiation pattern!  In some odd cases I’ve seen it happen, and in a car when the “whip” might have to be bent over the duck will likely work better.

So stop yakking and answer the question already!

Anyway, the long and the short of it is that it’s impossible to tell for sure what the “gain” of an antenna is without doing a lot of careful measurement under different circumstances with very expensive equipment — equipment that I don’t have.  I can’t calculate the “gain” relative to your stock “rubber duck” antenna because I don’t know the exact characteristics of that antenna.  Added to this is the fact that a typical handheld antenna is actually just half of a dipole, and it doesn’t tend to hold still or remain constant relative to things near by that might affect the performance of the antenna — things like cars, houses, trees, fences, other people, your arm, etc.

The dirty truth is that even SWR readings on a handheld antenna may vary as much as 1:1-5:1 depending on what is near, where the handheld sits, how the antenna is mounted, and any number of other factors.  (Yes, I’ve measured that). When companies say that their handheld antenna gets 1.5:1 VSWR they are telling you that they managed to find some setup where they could measure that, not that you should actually expect that performance.  In my experience, most handheld antennas are actually operating at more like 3:1.

Our antennas work very well — they should work *a lot* better than the stock antenna on your handheld.  If we trust gain figures from other similar commercial antennas we might guess that these are approximately 2dB on 2m, probably 2dB to 3dB compared to an isotropic antenna on 70cm.  We could further deduce that these should be about +6dB compared to “typical stock HT antennas”… and just think, with that and $5 you can get a happy meal at McDonalds!

The one thing to note is that some other antennas have a matching section in the base that turns the 70cm function of the antenna into a 5/8 wave. Signal Sticks are 3/4 wave on 70cm, which will tend to only be a little better than a really well made rubber duck.


I hope that answers some questions!

10 thoughts on “What kind of gain do the Signal Sticks have?

  1. I think a more appropriate question would be, “What kind of looses does your antenna not have.” If SWR is a great indicator of emission efficiency, you could use a twenty five cent Radio Shack light bulb and be fine. Small, cheap and you can use it to find your keys in the dark.
    Larry Jacobs – WA7ZBO

    1. Well said!

  2. I have purchased 3 of your antennas. Wondering what is the max watts they can handle? Could I hook this to a mini mobile @ 25 watts?

    1. You won’t damage the antenna, but at higher power ratings it might start to heat up more than you like — I haven’t tested this extensively. I’d generally look for something more stable for a mini mobile (half wave telescoping, roll up j-pole, etc), but if you try and somehow break the antenna let me know — I’ll replace it for free (lifetime guarantee) and we’ll know there is a limit.

      1. I don’t want to damage one of the antennas. Probably not good to be that close to 25 watts of RF. I have an Ed Fong DB-2 roll up that will handle 50 watts. Better to have the antenna elevated to improve the transmit and receive performance. Your antennas work great, especially when adding a 19 inch counter poise to my HT’s.


  3. Can I stop by and pick up one…I commute from Ogden to draper.

    1. Hi Gary,

      I have been known to meet up with people but it’s usually not worth the time for either of us — shipping to anywhere in the US is only $2.66, so you’re not saving a lot of money over just ordering it online.


  4. You could list the gain in dBi or dBd. Then it’s being compared to either a theoretical isotropic antenna or standard half wave dipole. Either way it would give the consumer an apples-to-apples comparison against other antennas which also specify their gain relative to the same theoretical isotropic antenna or standard half wave dipole.

    1. We can certainly calculate what that would be — and I’ve got a friend working on that — but there are so many variables with the way a 1/4 wave HT antenna works in the real world on an HT that it’s *extremely* unlikely that it will be more than a “in an ideal world” type of number that has little bearing on reality.

      Of course, that’s what everyone else is reporting, so perhaps we should just roll our eyes and do so as well.

      My current estimate which we are trying to verify with Math is that it’s about 2.15dBi, which should be around 4.5dB gain relative to a typical rubber duck. In other words, 0dBd since it’s a quarter wave dipole, essentially.

  5. My Signl Stick does much better than a Diamond antenna as long as the Signal Stick, using my PicoAPRS V3 Tracker from DB1NTO. Hits on a digipeater 4mi away with 1W!

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