I can not get a signal. I have a BT box. The code is YVM3005. I have tried all that is required to do. Check plugs re-tune channels restarted box. When I checked the TV signal quality is says: Channel - unknown channel = signal strength 0% and signal quality 0%. However, I have another tv in another room and the signal to the aerial on top of of our house is working on OK on that TV. Can you advise please.