Sirio GP 108-136 LB-U: 108-136 MHz 1/4 Wave Ground Plane Antenna
Sirio GP 108-136 LB-U: 108-136 MHz 1/4 Wave Ground Plane Antenna
The Sirio GP 108‑136 LB‑U is a professional ¼ wave folded ground‑plane antenna
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Sirio GP 108-136 LB-U: 108-136 MHz 1/4 Wave Ground Plane Antenna
The Sirio GP 108‑136 LB‑U is a professional ¼ wave folded ground‑plane antenna

Sirio Antennas – CB, Amateur & Professional Radio Solutions

Sirio GP 108-136 LB-U: 108-136 MHz 1/4 Wave Ground Plane Antenna - PL259 CONNECTION.

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Product code: 57-457
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Item CostFinance OptionDepositMonthly PaymentsTotal Cost
£64.99
12 Months 14.9% APR
£6.50
£5.60
£73.71
£64.99
18 Months 14.9% APR
£6.50
£3.73
£73.71
£64.99
24 Months 14.9% APR
£6.50
£2.80
£73.71
£64.99
36 Months 14.9% APR
£6.50
£1.87
£73.71
£64.99
48 Months 14.9% APR
£6.50
£1.40
£73.71
£64.99
12 Months 19.5% APR
£6.50
£5.82
£76.40
£64.99
18 Months 19.5% APR
£6.50
£3.88
£76.40
£64.99
24 Months 19.5% APR
£6.50
£2.91
£76.40
£64.99
36 Months 19.5% APR
£6.50
£1.94
£76.40
£64.99
48 Months 19.5% APR
£6.50
£1.46
£76.40

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Sirio GP 108-136 LB-U: 108-136 MHz 1/4 Wave Ground Plane Antenna

Sirio GP 108-136 LB-U: 108-136 MHz 1/4 Wave Ground Plane Antenna - PL259 CONNECTION.


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The Sirio GP 87‑108 LB and GP 108‑136 LB are professional ¼ λ folded ground‑plane antennas designed for FM radio and VHF aeronautic band base‑station service. Built from anodized aluminium, nylon, and stainless steel, they deliver exceptional efficiency, durability, and weather resistance.

Both models feature a DC‑grounded radial whip for static‑discharge protection and a 360° omnidirectional radiation pattern for consistent coverage. The GP 87‑108 LB is tuned for the FM broadcast band (87–108 MHz), while the GP 108‑136 LB is optimised for air‑band service (108–136 MHz) — ideal for ground‑station and monitoring applications.


SpecificationDetails
Type¼ λ Folded Ground Plane
Frequency Range87–108 MHz (FM) / 108–136 MHz (Air Band)
Impedance50 Ω Unbalanced
Radiation Pattern360° Omnidirectional
PolarizationVertical
Gain0 dBd (2.15 dBi)
Bandwidth (VSWR ≤ 2:1)22 MHz (typical)
VSWR at Resonance≤ 1.2 : 1
Max Power1000 W
Feed SystemDirect DC‑Ground / Centre Feed
ConnectorUHF Female or N Female (depending on model)
MaterialsAnodized Aluminium, Nylon, Stainless Steel
Wind ResistanceUp to 160 km/h
HeightGP 87‑108 LB: 1190 mm / GP 108‑136 LB: 890 mm
WeightGP 87‑108 LB: 1500 g / GP 108‑136 LB: 1310 g
Mounting MastØ 36–40 mm

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