ANT500 from Great Scott Gadgets is a telescopic antenna designed for operation from 75 MHz to 1 GHz.  Its total length is configurable from 20 cm to 88 cm.  ANT500 is constructed of stainless steel and features an SMA male connector, rotating shaft, and adjustable elbow.

ANT500 is a 50 ohm antenna designed to match HackRF One.  It is the perfect first antenna for general purpose use with HackRF One.