Definition of "high frequency" []

• A radio frequency in the range between 3 and 30 megahertz. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "We are going to try to reach them via the Coastal Sentry Quebec on high frequency after they emerge from blackout, but that signal will be marginal."