WWV 25 MHz Signal Swapped to Circular Polarization, Reports Invited:

The resurrected 25 MHz signal of time and frequency standard station
WWV is now emanating
from a circularly polarized turnstile antenna. WWV had used a
vertically polarized antenna on 25 MHz in the 1970s. Silent since 1977,
the 25 MHz signal returned to the air on an “experimental basis” in
April 2014, and it’s been transmitting ever since — initially on a
broadband discone until August 2015, when it switched back to a
vertical, which it used until the July 7 switch to circular
polarization.

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