Sirio Gainmaster 5/8 Wave (CB & 10m Base Antenna)

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New Version UPGRADED 2024

Gain-Master Hi-Tech Fibreglass Base Station Antenna for CB & 10m Band.

Gain-Master™ is a 5/8λ high tech fibreglass base station antenna for CB and 10m amateur band completely designed by electromagnetic simulation to achieve the maximum gain and optimize the radiation pattern and bandwidth.

Engineered with the most advanced available technologies it is completely manufactured in Italy with high quality materials.
The new design of the radiant element (Patent Pending) works like a central fed dipole so all RF currents on the radiator are in-phase and the ground plane radials are not necessary.
The coaxial coil at the bottom works like RF-choke for the optimum decoupling from mast and feeding line.
Made of telescopic fibreglass tubes, it is DC-grounded for the best protection from static discharges.

Gain-Master™ is the new reference standard in its class of antennas.

For full details: Gainmaster Brochure

Technical Data


Type 0.625 λ center feeded vertical dipole
Frequency Range @ SWR ≤ 2.0 25.5 - 30 MHz 400 CB channel & 10m ham band
Impedance 50 Ω
Radiation Omnidirectional
Polarization Linear Vertical
Max Gain on the horizon 1 to 2 dB higher than conventional 5/8 λ
Max Power 500 Watts (CW) continuous, 1000 Watts (CW) short time
Ligthning protection All metal parts are DC-grounded, the inner conductor shows a
Connector UHF-female, PTFE insulator & gold plated central pin


Materials Whip made of white fiberglass four sections composite tube,
radiator made of copper wire and low loss coax cable,
stainless steel hardware, anodized AW6060 aluminium, UV
stabilized thermoplastic.
Wind Resistance up to 160 Km/h
Height (approx.) 7360mm with bracket, radiator 6850mm
Packaging Dimensions 1950 x 100 x 130 mm
Weight (approx.) 3 Kg
Mounting mast Ø 35-54 mm side mast with “V” bolt