Motorola 8505816K24 - This is a great antenna accessory to have for your UHF two way radio, allowing for great range capabilities - even with its 3" stubby size. This helical antenna is built for working in a wider frequency range, covering ranges within 403-440 MHz. It's heliflex structure has a thicker core that offers better coverage. Compatible with CP150, CP185, CP200, P10, P110, P200, P1225, PR400, HT600, HT750, HT1250, EX500, EX600, PR1500, SP50, GP300, MT1000 and SABER two way radios from Motorola.