There is nothing illegal about receiving these signals as it is the Earth's own natural radio sounds.

Here are some samples i made a couple of Years ago :-

Whistlers 

Whistlers2

Dawn Chorus

Here is a sample with my new improved receiver :-

VLF

This next sample is a fine example of whistlers with my receiver, kindly edited by Paul Abelian

 VLF2

Other stuff :-

Schematic of my VLF Receiver

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Pictures

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This is an image from a magnetometer in York, this shows us when the Earth's magnetic shield is disrupted by solar flares from the Sun, after activity of this kind usually then we can expect to hear those strange sounds on our vlf receivers.

This image provided by Aurorawatch, York, click on the image to visit their homepage :-

Lightning detector in the UK, click on the picture for the provider

VLF (Very Low Frequency), is a receiver for picking up Earth's natural radio, frequencies in question range from 0hz - 22khz.

What you receive are things called whistlers, sferics, tweaks, dawn chorus.

A search on the web for VLF will give you lots of details, along with how to build a receiver for yourself.

What you will hear most of the time are what's called sferics, that's the sound of lightning strikes 1000's of them happening around the World.

When certain conditions are right, you would then hopefully hear what's called whistlers, really strange when you hear them for the first time, also dawn chorus which sounds like birds twittering in the morning.

If you have any questions feel free to email me at mdennisond@sky.com

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