SportDOG SportHunter X-Series & SportTrainer Replacement Antenna - Grey replacement antenna for the SportHunter and SportTrainer Remote Transmitters (not including the SportTrainer 575). Whether your original antenna was lost or damaged, this antenna is the proper replacement. Simply screw this new antenna in, removing the old antenna if it’s still attached. SportHunter 825X (SD-825X), 1225X (SD-1225X), 1825X (SD-1825X) SportTrainer 875 (SD-875E, SD-875), 1275 (SD-1275E, SD-1275)