Features:
• Base station antenna, Mono-band
• Low-gain, Omnidirectional
• TORNADO 36-42, 42-50 and 50-60 tunable by whip lenght adjust
• Made of aluminium alloy 6063 T-832
P/N 2108901.00 TORNADO 50-60

Electrical Data
• Type: 5/8 λ Ground plane
• Frequency:
TORNADO 50-60: tunable from 50 to 60 MHz
• Impedance: 50Ω unbalanced
• Radiation (H-plane): 360° omnidirectional
• Polarization: vertical
• Gain: 1.2 dBd - 3.35 dBi
• Bandwidth at V.S.W.R. 2:1:
TORNADO 50-60: 3.1 MHz at 50 MHz
• V.S.W.R. at res. freq.: ≤ 1.2:1
• Max. power: 1000 Watts
• Feed system / position: transformer / base
• Connection: UHF-female

Mechanical Data
• Materials: Aluminium, Brass, Nylon
• Wind load / resistance: 146 N at 150 Km/h / 150 Km/h
• Wind surface: 0.13 m²
• Height (approx.):
TORNADO 50-60: 4100 mm
• Weight (approx.): 2100 gr
• Radial length (approx.): 1170 mm
• Mounting mast: Ø 35-42 mm

http://www.sirioantenne.it/vhf-base/tornado-series-36-60-mhz/