"Fred not sure what your point is about the harmonics of 279 is. 252 also has 4 harmonics in the MW band, 198 has 6.
So what?"

Fred thinks that by posting irrelevant nonsense, it makes him look like he knows what he is talking about.
On that subject though, when RTE first started using the old Atlantic 252 transmitter, they did have a nasty 3rd harmonic (756 kHz) which could be recieved for many miles around Summerhill.