40 KHz VLF antenna very low frequency fully weather proof narrow band scientific.

• This 40 kHz low frequency antenna is fully weather, sealed and requires no extra tuning. It is useful for monitoring, solar, flares, and geomagnetic activity by listening to the hemispheric wide lightning static that is receivable at these low frequencies 24 hours a day. Solar storms cause sudden gains or drops in lightning static strength. You can match any receiver input from 25 ohms to 300 ohms, simply by wrapping some wire turns around the center of the case , the antenna should be mounted 3 to 5 feet above ground level outdoors high elevations will not increase the gain. Get two of these to monitor in an X-Y pattern. Virtually indestructible it is is fully weather sealed and permanently tuned to the low frequency band of 39Khz-41 Khz.