Dave Holford writes:
[snip]
VOR, if you are in a quiet environment and listen carefully, has a slow
very low frequency variation - but they have a CW identifier and some
have voice broadcasts of weather information.

I was able to listen to STP VOR (108.0) on an analog-tuned FM
receiver when living in St. Paul. Not very exciting -- you
heard the voice and code identifier continually. Not the
most exciting listening...