To G3WKL, Re the location of the power line in your property, do you have any friends who have the gift of dowsing? I would willingly dowse it for you but, sadly, I'm too far away. 73 from Roger, G2A
It's also been audible here for years and as Jim says is just a steady unmodulated carrier. Nulls are about E-W so must be somewhere north from here (30 kms SW of London, IO91UF). Walter G3JKV. -- Or
Apart from the interesting account of the nulling experiment, below, I was intrigued by the mention of the "Watford Whistle" - grateful if Jim or others could elaborate on this or known power-line tr