Motorola Solutions Quality OEM Antenna. The Helical VHF 136-174MHZ whip antenna NAR6593A, NAR6593. Is compatible with APX radios. Designed for the 136-174 frequency band, if you're looking to use GPS capabilities with your APX two-way radio, then this is a great accessory to have. Built for tough environments, just like the APX series, this antenna integrates GPS use and is at a great length to achieve higher gain, better coverage and range. . Physical Characteristics Dimensions (IN-Inch): 8 (H) 0.5 (L) Compatible with two-way radios from the APX series below APX 4000 APX6000 APX7000 APX8000 SRX 2200