Amateur Radio:  Usable HF Frequencies
(page refreshed 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).
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).

Click here to the University of Massachusetts' Lowell Center for Atmospheric Research and latest Ionograms. 

Additional propagation data, as well as geomagnetic and solar information:

HF charts provided by IPS.  Copyright  Commonwealth of Australia 2008.  Solar-Terrestrial and HF and VHF propagation data provided and Copyright of Paul L. Herrman.
This site is provided as a public service for amateur radio operators by Remarkable Technologies, Inc.