1st let's take a look at the radio monitoring collars. Radio monitoring collars encompass two distinct components. The primary part of the pet monitoring gadget goes within the dog's collar and is constantly sending out radio indicators. The second part of the radio system is definitely the directional antenna or receiver which is constantly listening for the signal coming within the radio collar. The proprietor can tell if your dog is closer if your sounds within the antenna get louder or if your dog is acquiring farther absent as the sounds within the antenna are acquiring softer