That's exactly it, all the channels at one time, turned off overnight & then nothing at all the next morning, simple retune & they are all back. Sometimes its just the BBC channels that have disappeared but more often its everything. The aerial is about 2 years old, the outside box it plugs into the same, good quality cable, likewise inside the boat, nothings changed on that front. With the log periodic on a 5ft pole on the roof I've never had a problem finding a signal so never felt the need for any signal amplifier.