You are apparently operating the system on an active TV channel. To find out what TV stations are active, go to www.100000watts.com and click on your state and locality. If you are using Range "A" , (Channels 22 through 27), Range "B" (Channels 40 through 45) or Range "C" (Channels 59 through 64) then you would have to change your operating frequency to that of an unused TV channel in your locale.