Diamond RH951S SMA Female 144/440/1200 MHz Tri-Band Flexible Handheld Antenna Frequency: 144/430MHz / Gain: 2.15dB Max Power:10W / Impedance: 50 ohm Standing wave ratio(VSWR): &lt; 1.5 Plastic material housing and copper cord Overall length is 14.5 inches - length is fixed (it does not extend or collapse)