It was created in audacity, using a chirp from from a2 to g3, then using phaser, echo and tremolo effects to create the end result. Finally, it was normalized to -8db. Hope you enjoy!.
Probably kind of an old radio? mixed together from these sounds:. Https://freesound. Org/people/soundsofawesome/sounds/349330/https://freesound. Org/people/mattwasser/sounds/58932/.