Designed to sit on top of a 1.5-2" mast,
Alternatively you can use a FT-2 adapter bracket to mount it on any other size mast.

Specifications:

CB & 10m Base station antenna
Omnidirectional
Low radiation angle for excellent DX
High power handling capability
Made of aluminium alloy 6063 T-832
Tunable by whips length adjusting
Side mast mounting allowed by optional bracket FT-2
Type: 1/4 wave ground plane
Frequency range: tunable from 26.5 to 30 MHz
Impedance: 50ohm unbalanced
Radiation (H-plane): 360deg omnidirectional
Polarization: vertical
Gain: 0 dBd, 2.15 dBi
Bandwidth @ SWR <= 2: ; >= 2000 KHz @ 26.5 MHz
SWR @ res. freq.: <= 1.5
Max. power: 1000 Watts (CW) continuous 3000 Watts (CW) short time
Connector: UHF-female
Materials: Aluminium, Chromed brass, Nylon
Wind load / resistance: 75 N at 150 Km/h / 130 Km/h
Wind surface: 0.07 metres squared
Height (approx.): 5040 mm
Weight (approx.): 1230 gr
Radial length (approx.): 2690 mm
Mounting mast: 35-40 mm