The Electrical Experimenter, April, 1914, page 183:

UNIVERSITY  OF  CALIFORNIA  DOING  GOOD  RADIO  WORK.

    University of California wireless telegraph experimenters listened in at a conversation between islands 6,100 miles away a short time ago, making a record for the Pacific coast at least. The message was being sent from one of the Caroline islands to one in the Marshall group, and was in cipher, so that the students at the university were not eavesdropping in a way to annoy the people 6,000 miles away. The achievement comes just after a telephone talk through the air from San Jose to Point Arguello, a distance of 300 miles. Prof. Charles D. Herrold, who accomplished this communication, claims that it is the longest distance the wireless telephone as yet has successfully spanned.
    Professor Herrold is leading a corps of students in the development of wireless telephony, which is counted upon to have highly practical value. Communication between vessels on the Pacific and the shore may be carried further through the ordinary telephone service, so that a person on board ship may presently be able to call up a home telephone through an exchange equipped with both wire and wireless instruments. From the roof of the bank building in San Jose, where he made the record length of talk through the air, Professor Herrold established wireless telegraphic connection with Key West, 3,100 miles. Communication with vessels 2,800 miles at sea is common, and talk with Honolulu is a nightly event.
    Any record of achievement in wireless communication is but a note by the way. The extraordinary accomplishment of one day is the commonplace of the next. The distance spanned by wireless telegraphy has been stretched beyond 6,000 miles, without indication of any limit being put upon it, and the goal is talk around the world (or rather half-way around, a distance of 12,500 miles about which is not far in the future, according to the predictions of the experimenters.