The Sirio Vector 4000 CB antenna is a powerful and tall 7/8 wave base antenna. It is omnidirectional and adjustable by whip length, with high power handling capability. Made of aluminium alloy 6063 T-832, it has a lower radiation angle for optimal DX. The antenna has a new tuning possibility and its part number is P/N 2100701.00 new Vector 4000. The electrical data type is 3/4 λ coaxial J-pole and the frequency range is adjustable from 27 to 28.5 MHz. It has a 50Ω impedance and a 360° omnidirectional radiation (H-plane) with vertical polarization. The gain is 2 dBd or 4.15 dBi and the bandwidth at SWR ≤ 2 is ≥ 1400 kHz. The SWR at the resonant frequency is ≤ 1.2 and the maximum power is 1000 watts (CW) continuous or 3000 watts (CW) short time. The feed system/position is a gamma match and the base connector is UHF-female. The materials used are aluminium, steel, and nylon. The wind load/resistance is 329 N at 150 km/h / 130 km/h and the wind surface is 0.29 m². The antenna is approximately 8480 mm in height and weighs approximately 4700 g. The mounting mast required is ø 35-42 mm.