The Diamond CR-77 antenna is a short car antenna covering 144 and 430MHz (2m/70cm). Despite its small height (29 centimeters), it offers a gain of 2.15dBi at 430MHz and can withstand power up to 100W. Technical Specifications: Frequency range: covers 144MHz and 430MHz (2m/70cm) Gains: 2.15dBi at (144/430MHz) Maximum power: 100W Impedance: 50 Ohm Height: 29cm Weight: 90 gr Connector: MP (male) Type: 1/4 wave (144MHz), 1/2 wave (430MHz)