This is the genuine Diamond D777 High Gain 120/300MHz Air Band Antenna.

Designed for maximum performance on both the Civil and Military Air Bands.

• Receiving frequency:VHF 120MHz /UHF 300MHz air bands
• Gain:3.4dB(VHF),5.5dB(UHF)
• Type:2 x 5/8 wave (300MHz) 5/8 wave (120MHz)
• 3  x Ground Plane Radials
• Impedance:50ohm
• Length:approx.1.7m
• Weight:1.0kg
• Connector: SO239 (takes normal PL259 plug)
• Rated wind velocity:60m/sec.
• Mast diameter accepted:30mm to 62mm