Shortwave radio crosses oceans without satellites or the internet. A transmitter in one country bounces its signal off the upper atmosphere and a listener thousands of kilometres away hears it live. For most of the last century you needed a shortwave set and a long wire antenna to join in. Today you can listen through someone else’s.

Receivers you can borrow

Hobbyists around the world run KiwiSDR receivers: small software-defined radios connected to an outdoor antenna and to the internet. Many owners make theirs public, so anyone can tune it from a web browser. Because the receiver sits under real sky, you hear exactly what that antenna hears: the broadcast, the fading, the static and all.

That is different from an internet radio stream. A stream is the station’s studio audio sent over the internet. A KiwiSDR gives you the signal after it has travelled through the air, which is the whole point of shortwave listening.

Picking a receiver

  • Distance matters, but not the way you think. A receiver near the transmitter hears it loudly; one on another continent tells you whether the signal is really getting through.
  • Time of day matters more. Lower frequencies carry farthest at night, higher ones in daylight (see how skywave works).
  • Respect the owner’s limits. Each receiver allows a few listeners at once, and some owners only allow listening on their own site.

Skywave DX does the picking for you: it looks up what is scheduled on the air right now, chooses a receiver that can hear it, checks that there is a signal rather than noise, and moves on if there isn’t.

What to try first

  1. A time station. WWV on 10 MHz ticks every second, around the clock. If you can hear it, the receiver works.
  2. A big international broadcaster. Shortwave is still used by international services such as the BBC World Service, Radio Romania International and China Radio International. The “On air now” list shows what is scheduled this minute.
  3. Something unusual. Shannon VOLMET reads airport weather to transatlantic pilots, day and night.

Getting the most out of it

Shortwave is not hi-fi. Expect fading as the signal’s path changes, and some hiss. Headphones help. If a broadcast is weak, try again an hour later or on a different frequency: international broadcasters often use several at once for exactly this reason.

When you catch something far away, write it down. A DX log is half the fun, and Skywave DX keeps one for you.