Following Stefan's suggestion I'm currently recording the VLF noise 0-24kHz at my QTH using the earth electrodes and small FET tuned preamp. Results are being uploaded to my grabber at https://dl.dro
Looks good Roger - Im also following Stefans request - http://kl7uk.com/VLFAlaska.html The roll off in sensitivity is intentional at the "HF" end. Antennae is loop out in the woods to Jims design plu