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In a couple of my articles I provided a link to the MUF (Maximum Usable Frequency). Since then AF7TI has taken down this data source. Thanks to Carl, K9LA, here is another source wherein you can look up the MUF for worldwide ionosondes:
https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/RealTime_foF2.html
You will find most helpful Millstone Hill, MA, which is located in Westford. Mass.
—Layne AE1N
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