Sigma Eurocomms
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Sigma Euro-Comm Limited
Proudly family-run since 1990, Sigma Euro-Comm is a UK-based manufacturer specialising in high-performance CB antennas. With over three decades of hands-on experience, we design, engineer, and build every antenna at our dedicated factory in the heart of Birmingham. Our commitment to quality, precision, and customer satisfaction has earned us a trusted reputation across the industry. At Sigma, we don't just make antennas - we craft reliable communication tools built to perform, built to last. When you choose Sigma, you're not just buying a product. You're investing in British-made quality, decades of expertise, and the kind of personal service only a family business can deliver
SIGMA EURO-COMM HF AM-PRO Mini Dipole 20m 14 MHz
Trusted Seller
Free UK Delivery - On selected Products
Over 30 Years Experience - est 1990
Description
Sigma Euro-Comm HF AM-PRO MINI DIPOLE 20m

These consist of two Pro-HF mobile whips for the band of choice, a short stub mast fitted with a dipole centre and a fixing bracket.

Loosen the grub screws at the top of the loading coils and slide the whips in to the point where the black ring is marked on them and tighten the grub screws with the supplied alan key.  Screw the two completed whips into either side of the dipole centre. A 13mm spanner may be necessary to ensure they are tight.  Also attach your coaxial cable (50ohm) to the SO239 socket.

Using either an antenna analyser, or your transceiver with a SWR meter, adjust the whips to tune on your favourite spot.  The bandwidth may be rather narrow so choose for your favourite mode – the CW portion will be near the black mark the DATA portion a little higher up the band and the phone portion even higher.  Remember that the shorter the antenna, the higher the resonant point.  As it is a balanced dipole antenna remember to adjust each side equally. Use of an external ATU can extend the tuneable

range / bandwidth of the antenna.


Once you have your match, fit the stub boom and antenna to your mast using the supplied clamp and raise it up to operating position.  This is also suitable for loft mounting.


SIGMA AM-PRO 20 Meter HF Antenna

Specifications

●    Power handling 250 watts

●    Length  5 Meters / 16 feet 4 inches (Approx)

●    Impedance 50 Ohms

●    Frequency 14 MHz

●    SWR 1.5:1

●    Whip 17.7 ph stainless

●    Fitting 3/8 UNF

●    Made in Great Britain

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SIGMA EURO-COMM HF AM-PRO Mini Dipole 20m 14 MHz
Sigma Euro-Comm HF AM-PRO MINI DIPOLE 20m

These consist of two Pro-HF mobile whips for the band of choice, a short stub mast fitted with a dipole centre and a fixing bracket.

Loosen the grub screws at the top of the loading coils and slide the whips in to the point where the black ring is marked on them and tighten the grub screws with the supplied alan key.  Screw the two completed whips into either side of the dipole centre. A 13mm spanner may be necessary to ensure they are tight.  Also attach your coaxial cable (50ohm) to the SO239 socket.

Using either an antenna analyser, or your transceiver with a SWR meter, adjust the whips to tune on your favourite spot.  The bandwidth may be rather narrow so choose for your favourite mode – the CW portion will be near the black mark the DATA portion a little higher up the band and the phone portion even higher.  Remember that the shorter the antenna, the higher the resonant point.  As it is a balanced dipole antenna remember to adjust each side equally. Use of an external ATU can extend the tuneable

range / bandwidth of the antenna.


Once you have your match, fit the stub boom and antenna to your mast using the supplied clamp and raise it up to operating position.  This is also suitable for loft mounting.


SIGMA AM-PRO 20 Meter HF Antenna

Specifications

●    Power handling 250 watts

●    Length  5 Meters / 16 feet 4 inches (Approx)

●    Impedance 50 Ohms

●    Frequency 14 MHz

●    SWR 1.5:1

●    Whip 17.7 ph stainless

●    Fitting 3/8 UNF

●    Made in Great Britain

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