I have the following signal in attachment, which is transmitted all the time at roughly 458.208 MHzMegaHertz (MHz) 10^6 Hz (center frequency), in four distinct frequencies separated by about 12.5 KHzKiloHertz (kHz) 10^3 Hz. Each of the signals is roughly 5 KHzKiloHertz (kHz) 10^3 Hz in bandwidth. The signals are received in Portugal near Lisbon. I have no clue what is the exact origin of this signal. Analysing carefully is seems that some of the bursts are slightly shifted in frequency and have varying intensities, suggesting that the channels are shared by several stations.