Motorola HAF4013A 800 MHz Antenna Kit 

The 3db Through Hole Mount Antenna (HAF4013A) is designed for the 762-870 frequency band and is compatible with APX 8500, 7500, 6500, 4500, and 1500 series mobile two way radios. It's designed to direct the signal toward the horizon, making it ideal for applications in more geographically flat regions where signal coverage is sparse and must cover a large area.  This is a genuine Motorola accessory.