The Sirio Vector 4000 CB antenna is a new version similar to the "Avanti Sigma IV" and is an extremely powerful and tall 7/8 wave base antenna. It features a base station antenna that is omnidirectional and adjustable by whip length, with high power handling capability. It is made of aluminum alloy 6063 T-832 and has been upgraded to have a lower radiation angle for the best DX. The antenna also 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. The impedance is 50Ω and the radiation (H-plane) is 360° omnidirectional 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 aluminum, 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 height of the antenna is approximately 8480 mm and it weighs approximately 4700 g. The mounting mast required is ø 35-42 mm.