3 Inch SportDOG Brand replacement antenna Designed for easy replacement of your transmitter antenna Compatible with SD-800, SD-825, SD-1225, SD-1825, SD-1825CAMO, and SD-3225 Built for the Field: SportDOG gear was designed by professionals who demand durable, no-nonsense tools that perform in real-world conditions without fail Trusted by Serious Trainers: Professionals rely on SportDOG for proven performance, consistent control, and expert-backed training guidance that gets results