There will be an experiment during the Aug 21 solar eclipse conducted
using WWVB on 60 KHz and a U.S. Navy transmitter on 55.1 and 135.95kHz
operating from California. This is a'crowd sourced' experiment.

More info:
There's a massive experiment relating to the strength of WWVB and a
transmitter in Dixon California.

https://www.washingtonpost.com/news/speaking-of-science/wp/2017/07/12/a-massive-atmospheric-experiment-is-planned-for-august-solar-eclipse/?utm_term=.4d7101b869f6

http://eng.umb.edu/~eclipsemob/index.php
<http://eng.umb.edu/%7Eeclipsemob/index.php>

http://www.hamsci.org/sites/default/files/publications/2017_IES_Liles.pdf
This article says Dixon may transmit at 55.1 and 135.95 kHz.

The EclipseMob receiver works with a smart phone acting as an SDR. as well
as the source of it's position and the date-time of observation.

There is a parallel study based on ham radio WSPRNet and Reverse Beacon
Network.
http://hamsci.org/