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Airband

I used to DX the Airband long ago when I had one of those multi band portable radios.

Yes, it does start at 108 MHz but even very recently, I've heard some air to ground communications break in way down on the FM band.
 
The Aeronautical band(s) are from 108.0 MHz to 137.0 MHz
 

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I take it the air communications I hear once in a while on FM are only bleed over echo signals from the Airband?
 
Probably some kind of image product due to two signals mixing (in your receiver) and producing a sum or difference frequency which falls within the FM band.

Frank
 
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