Talking on the cell phone through the 1.7 milEisenhower Tunnel.
Normally, when we go through the tunnel, we hear a 60 Hz. interference on the AM radio presumably from the long fluorescentube light ballasts the full-length of the tunnel.
That interesting sound is heard nowherelse.
Many miles west of the tunnel, the cellphone call is concluded and I turn up the radio. We hear that same tunnel interference as though we are traveling through the tunnel!
It lasts the same amount of time as traveling through the tunnel and then we hear the AM station coming back in just like when emerging from the tunnel!
This was nearing Frisco, Coloradope, where we are not near anything that I can imagine produces the unique tunnel interference sound.
Is the Letsuck radio somehow downloading the radio program and playing it back?