Is this item easy to swr in?

No swr needed however it can be high if near certain objects , mines just under 2 works canny

How do you SWR this antenna ?

You don’t it works against precise coax length

On a good day I managed to get to Spain Germany and Poland but conditions have to be right

I'm new to this so apologies if this is obvious, does this antenna require ground plane?

I've never had ground plane on mine and there hasn't been any problems

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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SIRIO antenne THUNDER 27, Fixed CB Antenna 1/4 λ Helical Loaded Dipole, Frequency 25-29MHz Pretarated, Independent of Ground Plane, Gain 2.15 dBi, Maximum Power 300 Watts (CW) Short Time, A

Product ID: 194298955

Details

Antenna
Radio
Brand
SIRIO antenne
Colour
Global Trade Identification Number
Impedance
50 Ohms
Manufacturer
Sirio Antenne

⚡300W Max Power (Short Burst)

📡1/4 λ Helical Loaded Dipole

📶25-29 MHz Frequency Band

Description

📡 Stay Connected, Stay Ahead – The THUNDER 27 Means Business!

POWER TO CONNECT - Handles up to 300 watts short-time power for robust, clear communication.
PLUG PLAY READY - Standard UHF Female (PL259) connector for seamless integration with your setup.
WIDE FREQUENCY RANGE - Optimized for 25-29 MHz, covering all essential CB channels with ≥5 MHz bandwidth.
COMPACT LIGHTWEIGHT - At just 0.7 kg, easy to install and perfect for mobile or fixed use.
EFFORTLESS SIGNAL MASTERY - Helical loaded design ensures superior reception without needing a ground plane.

The THUNDER 27 is a fixed 1/4 wavelength helical loaded dipole CB antenna designed for 25-29 MHz frequency range. It delivers a gain of 2.15 dBi and supports up to 300 watts short-time power, independent of ground plane requirements. Lightweight and easy to install with a UHF female connector, it’s ideal for reliable mobile and fixed communication in challenging signal areas.

Specifications

ASIN	B07JW14HWN
Antenna	Radio
AntennaDescription	Radio
Best Sellers Rank	81,061 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 282 in Radio Antennas
Brand	SIRIO antenne
Brand Name	SIRIO antenne
Colour	Black/Aluminium
Customer Reviews	3.9 out of 5 stars 225 Reviews
Global Trade Identification Number	08056182110176
Impedance	50 Ohms
Item Type Name	Fixed Cb Antenna
Item Weight	0.7 Kilograms
Manufacturer	Sirio Antenne
Manufacturer Part Number	THUNDER 27
Maximum Range	0.32 Metres
Maximum range	0.32 Metres
Model Number	2107902.00
Number of Channels	1
Number of Items	1
Number of channels	1
Unit Count	1.0 count

Reviews

S**S

Antenna

Good quality and quick delivery

16.01.2025

T**K

Signal strength

Mobile comunication between family cars. Cheaper than mobile phones. We live in a very bad signal area.

11.02.2022

R**K

Not a very good antenna at all

I should have read the reviews before I bought this am ten floors up and the reception is very poor indeed

1.01.2024

P**R

Works well

Good Ariel works well easy to put up quick delivery

9.03.2020

S**Y

Stevige antenne

Kompakt en loopt van 26Mhz tot 28Mhz met een redelijke swr op 27Mhz.Prijs kwaliteit zijn in balans.

17.03.2026

A**O

Antenna

Ottima antenna fissa per Cb...ha una buona resa se esposta bene

2.01.2026

Y**O

Antena sirio

Buena calidad de materiales, aunque da roe alto espero bajarlo con cambio de cable, venía impresionantemente bien embalado.

25.10.2025

B**T

Bon

Bonne antenne sur toute les fréquences.

23.09.2024

G**A

Viste le dimensioni, funziona correttamente.

Viste le dimensioni, funziona correttamente. Cosa volete da 90 cm di antenna nella 27 ? è facile da montare, occupa poco spazio e fa un po' tribolare con il ROS: a seconda delle condizioni di montaggio deve essere collegata a terra oppure no. Comunque fa bene quello che deve fare.

29.12.2025

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