The best replacement for shortwave is ham.

The best alternatives to shortwave are rated as following:
★★★★★  ham
★★★★  longwave radiation
★★★★  longwave
★★★  ham radio
★★  longwave uv
★  cb
★  noaa
  internet radio
  cb radio
  long wave
  short wave

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Google Trends

Scale is based on the average worldwide traffic of shortwave in all years. Click on graph for more.
shortwave
ham
longwave radiation