A welcome overcast day with light rain. Inexplicably, I heard air traffic control on the same frequency as the satellite NOAA-19. I was sitting on the concrete bleachers of the local sports ground, beneath a GSM mast for mobile (cellular) phones, but I cannot think think that could have had an effect. The transmission seemed too strong to be a harmonic. Decreasing the bandwidth to exclude the noise worked well. I feel lethargic.