if you are sure there is rf interference in the house, put a variable cable line drop in the antenna cable for the rf reciever. The variable attenuator is avail. at radio shack. Start w/ 0 drop and increase level til you have the best reception. This helps to reduce the amount of stray rf recieved by the system. Once you have a value of the drop necesary, pull the variable unit out, and put in a fixed cable drop for the value you need. Good Luck.