This thing would not work ten feet in light tree brush. I had to take an old remote control antenna used for a toy car and wire it up to the base unit, then pull the inner antenna out of the detector through a hole I drilled before hot gluing around it to seal out moisture. Now it works as advertised. I gave it two stars because I could at least work with it. But unless you want to go through what I went through or you just like returning stuff, do not buy.