Hello, everyone. I saw a Sirio antenna on Amazon called the GP2745. I was wondering if anyone had ever used this antenna or knows anything about it? I was thinking of giving it at try since they are only asking $80 for it. Thanks in advance for the advice!
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Sirio GP2745 antenna
- Thread starter sjm83651
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I've used a few that were very similar and with about the same angle on the radials. It works about as good as any 1/4 wave ground plane and its not that much different than the old A/S Starduster or the newer Sirio version of it.
Edit: Now that I think about it these ground planes with extreme downward angles on the radials may work slightly better than a ground plane with horizontal elements. The A/S Starduster was reported to work very well in its day and better than a 1/4 wave ground plane. I had one but never did a side by side comparison. The reason I say it may work slightly better is because ground radials that are all on the same plane as in 90deg to the vertical element would not radiate because there is equal RF currents going in opposite directions at any given point which cancels radiation. Compared to a 1/2 wave dipole a 1/4 wave ground plane looses a little gain because of this.
When bending ground radials downward, at some point the RF is going essentially the same direction at any given time and now opposite to the vertical radiator making it more like a dipole than a 1/4 ground plane. The most extreme version of this would be a coaxial dipole with a grounded sleeve for the ground radial side. The A/S Starduster and possibly this Sirio ground plane may be working in the region where the ground radials are actually a radiating part of the antenna. I don't know for sure but that's my guess. Anyway, $80 is pretty cheap for a CB base antenna these days.
Edit: Now that I think about it these ground planes with extreme downward angles on the radials may work slightly better than a ground plane with horizontal elements. The A/S Starduster was reported to work very well in its day and better than a 1/4 wave ground plane. I had one but never did a side by side comparison. The reason I say it may work slightly better is because ground radials that are all on the same plane as in 90deg to the vertical element would not radiate because there is equal RF currents going in opposite directions at any given point which cancels radiation. Compared to a 1/2 wave dipole a 1/4 wave ground plane looses a little gain because of this.
When bending ground radials downward, at some point the RF is going essentially the same direction at any given time and now opposite to the vertical radiator making it more like a dipole than a 1/4 ground plane. The most extreme version of this would be a coaxial dipole with a grounded sleeve for the ground radial side. The A/S Starduster and possibly this Sirio ground plane may be working in the region where the ground radials are actually a radiating part of the antenna. I don't know for sure but that's my guess. Anyway, $80 is pretty cheap for a CB base antenna these days.
Last edited:
FPR1981
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I just bought my brother one, and it's great. It's a simple design that's been around for years. Hard to screw up. Will work very well when placed up high, and you can hit them with plenty of power.
It's kind of like a Starduster M-400 without the umbrella skeleton supporting the radials. This is a good value in base station antennas. And I concur with PRC, $80 is a bargain. Antenna prices have gotten stupid in the past six months.
I had the Sirio GPE27 5/8. I paid $95 shipped to my door in January. If you can find them anywhere right now, the cheap side is $149, and some places want almost $200 for them.
The Starduster jumped from $79 to $149 and you can't find the Tornado 27 anywhere.
I paid about $215 shipped for the Vector 4000, and I shudder to think what it would cost right now if you can find it in stock.
It's kind of like a Starduster M-400 without the umbrella skeleton supporting the radials. This is a good value in base station antennas. And I concur with PRC, $80 is a bargain. Antenna prices have gotten stupid in the past six months.
I had the Sirio GPE27 5/8. I paid $95 shipped to my door in January. If you can find them anywhere right now, the cheap side is $149, and some places want almost $200 for them.
The Starduster jumped from $79 to $149 and you can't find the Tornado 27 anywhere.
I paid about $215 shipped for the Vector 4000, and I shudder to think what it would cost right now if you can find it in stock.
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