Ah, now I too think that we are getting close to the answer. A strong Transmitting Signal can cause all sorts of problems to T.V's, Stereos & Hi-Fi's, Even Lights in the house, possibility of them dimming or even getting brighter & on occasions switching on & off. Sometimes my voice (unrecognisable) coulkd be heard mumbling through Hi-Fi or T.V Speakers. When I had my ham radio in my car, If I was parked close to a shop or house with an Alarm System, as soon as I keyed the mike to speak, the alarms would set off (so did I !!). Check out the Wireless Internet Connection theory as the more I think about it, the more I am convinced that this is the problem. A qualified T.V Engineer should be able to help. Good Luck,