Diamond SG-507 antenna structure succinct, sprightly, outlook artistic coordination, performance stable, the installment convenient, is reliable, is each kind of motion communication user extremely good chooses. Specification: technical specification: Frequency range:144/430MHz band width:6MHz(144MHz) 10MHz(430MHz) input impedance:50¦¸ standing-wave ratio:¡Ü1.5 Gain:2.15dBi /5.2dBi power capacity:70W Vertical radiation direction:Omnidirectional lightning protection protection:Direct-current earth altitude:730mm base diameter:¦Õ21.8mm weight:155g