Long Range Antennas precision manufactured in the U.S. and individually hand tuned. Increases range significantly over the factory antenna and is only 5" long (2" shorter than factory models. Fits most XL XLS transmitters (Handhelds) and older. If the antenna base of your unit -(handheld or collar) looks like those in picture this is the correct antenna. If your unit has a helical insert in the threaded base (as shown in picture) your unit uses our G2 antenna (listed separately). If your unit does not have the insert, this is the correct antenna for it. Please ask if in doubt.