When camping in my camper-van, I use a similar unit modified for in-vehicle use (The WR-4b) that has the same sensitive input circuitry and identical audio amplifier.ДЄll WR-3's have BNC antenna connectors (Amphenol female-bulkhead-receptacle type) on their topsides for use with telescoping whip antennas that have a male BNC connector mounted on their base. When I must bicycle or walk into listening sites or simply to check out a potential listening site for extended recording sessions, I use a WR-3 hand-held unit to make my observations and to check for powerline hum levels and site suitablity conditions. The unit is highly portable, and I use a a few of my own collection during my VLF recording expeditions. The WR-3 is a self-contained, hand-holdable unit. All are listenable with the WR-3 presently and depending upon daily/nightly conditions.ДЄ montage of my own large collection of various WR-3s and prototypes and a shot of me in the eastern Mojave Desert listening to sunrise whistlers. I like listening to the beautiful sounds of night-time lightning static 'tweeks' which I find beautiful and musical. Equinoctal periods (April/October) often also offer the best months of whistler and potential chorus reception. There are about 1 to 3 days of good whistler-listening mornings and about midnight period Winter 2017-2018.

Here is information about the WR-3, a compact, fully hand-held and self-contained ELF-VLF receiver I manufacture and sell which allow you to do your own listening and observing of natural ELF-VLF radio phenomena signals for the start (and now solar-minumum period) of Solar-Cycle 25. Older WR-3 with shiny aluminum enclosure and the Super Stick II whip antenna Discover the World of Natural Radio Below 10 kHz! Musicians, Field-recordists, ELF-VLF-hobbyists, ham radio folks, and an amazing variety of people who are exploring new radio/audio realms are listening to natural radio and using the sounds in their own musical works. Each new WR-3 receiver comes with the Smiley Antenna Superstick II antenna.

Vlf receiver antenna