The Diamond D-777 is a dual-band receive-only base station antenna covering 120–300 MHz — designed for airband (VHF civil aviation) and military/government communications monitoring. Operating as a 5/8 wave at 120 MHz and a 2×5/8 wave at 300 MHz, it delivers genuine gain over a standard dipole on both bands, making it a capable choice for serious airband listeners and scanner enthusiasts wanting to maximise reception range.Built to withstand wind speeds up to 60 m/s, it's suitable for permanent rooftop or mast installation. Fits masts from 30–62mm in diameter and connects via SO-239 socket.Note: Receive only — not for transmitting.Key Features Frequency: 120–300 MHz (receive only) Type: 5/8λ at 120 MHz | 2×5/8λ at 300 MHz Gain: 3.4 dBi (120 MHz) | 5.5 dBi (300 MHz) Impedance: 50Ω Connector: SO-239 Length: approx. 1.7m Rated wind velocity: 60 m/s Mast diameter: 30–62mm Technical Specifications Frequency: 120–300 MHz Type: 5/8λ (120 MHz) / 2×5/8λ (300 MHz) Gain: 3.4 dBi / 5.5 dBi Impedance: 50Ω Connector: SO-239 Length: approx. 1.7m Wind rating: 60 m/s Mast diameter: 30–62mm
