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Amateur Radio:
Usable HF Frequencies
(page refreshes every 20 minutes)
Use the indicated color (red, yellow, green, blue,
white, etc.) to determine
the recommended HF frequencies for contacts from your nearest BASE
(New York, Boston, Atlanta, Orlando, Kansas City, Phoenix, San
Francisco, and Seattle) to a desired location (local region, country, or continent).
Any white "bubble" indicates no suitable frequency or high absorption.
NOTE:
The New York and Seattle BASE images provide a general view of global DX from the U.S.
NOTE: Right-click on any image to view the image
larger (such as in a new tab).
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NEW!
Click
here to the University of Massachusetts' Lowell Center for
Atmospheric Research and latest Ionograms. In the page that will appear, select MHJ45 for the Millstone Hill radio telescope located in Westford, Massachusetts. Then select the Year, Month, and Day for the current ionogram.
Additional propagation data, as well as geomagnetic and solar
information: 
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