Snotel Online Article
picked up SNOTEL on 40.670 today here in north-east New Jersey. first I've ever heard of this. Possibly my best DX yet. very clear signal at points. no longer able to pick it up.
You may also be interested in a recent article that has been posted about the SNOtel-SCAN system you are referring to.
It is for the most part generated for those listening to meteor returns by the using the master station multiple transmitters located in the US operating on 40.67 MHz.
Another similar article is being written for release soon about using low band (54-88 MHz) DTV transmitter pilot carriers for the same purpose.
The online article is located at:
Denny K0LGI - SNOTEL among several other items relating to radio detected meteors at:
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Denny - K0LGI