Sirio SG-AC/U SO-239 Body Mount W/Cable Frequency Range: from DC to 500 MHz Overall Size:  41 mm Mounting Hole:  16 mm Materials: Brass nichel plated, PTFE insulator, Gold plated pin @ SWR  2:  2500 KHz @ 27 MHz SWR @ res. freq.:  1.2 Max. power: 1000 Watts (CW) continuous 3000 Watts (CW) short time Cable: 4 m RG 58 / UHF-male (PL259) Antenna connection: UHF-female