The SportDog Replacement Antennas are custom fitted to each transmitter in the SportDog line. Please make sure to replace your antenna with the proper size for your SportDog Transmitter.
The 7.5" Antenna fits: SD-2400
(ST100-P), SD-2500, SD-3200
Factory authorized partSD-3200 can use either a 3.5" or 7.5" antenna depending on desired range