Off what layer of the atmosphere do FM radio waves bounce off of?

Answer 1

FM frequencies don't bounce off any layer. But higher frequencies (shortwave and some AM) will bounce off the ionosphere.
this is why you can't get FM stations from other parts of the world, only the local area. But you can pick up some AM and shortwave reception.

Answer 2

In don't know in which country you are living nor the type of broadcasting you have there but I believe frequency modulated (FM) broadcasting radio is mostly on the VHF frequencies. Those are not affected by the layers of the ionosphere. As a radio amateur, I have used radio-telegraphy to contact New Zealand, that is at my antipode, but that was one medium frequency and not VHF.
The latter is not reaching much more than the line of sight although I know that some ham use VHF in meteor scatter very short periods that works like a reflecting layer for VHF radio. But it lasts only a few seconds.
My own experience of FM VHF radio at sea is that the range is increased by a high atmospheric pressure. Once, in my sailboat, I could hear both the British coast guards and a Norwegian coast station on the same channel 16. This is very rare though.

Answer 3

Hi. The F layer but it is solely dependent of the MUF, or maximum usable frequency, not the modulation type. http://www.smeter.net/propagation/skytrig.php

Answer 4

The ionosphere , it is what you smell just before and after the rain. Also after the rain you can smell the wet damp earth

Answer 5

THE IONOSPHERE ALSO KNOWN AS THE KENNELLY-HEAVYSIDE LAYER.