An original scan of this newspaper article is located at: http://chroniclingamerica.loc.gov/lccn/sn83030214/1910-03-01/ed-1/seq-14/
Thanks to Tal Hazelden -- great-grandson of the Metropolitan Tower station operator, Charles C. Heselton, Sr. -- for alerting me about this article.
 
New-York Tribune, March 1, 1910, page 14:

WIRELESS  SENT  AFAR.
___________

New  York  and  Milwaukee  Exchange  Messages.

    "Editor 'Milwaukee Journal': Greetings, by radio-telegraph from Metropolitan tower, New York. Developments in past year have been startling. Commercial wireless service will be assured in 1910. Lee de Forest."
    The foregoing message was sent last night and repeated several times to insure success, according to C. C. Heselton, operator at the Radio-Telephone Company's station at the Metropolitan tower, who said that communication with Milwaukee was obtained at 9:15 o'clock last night. A telegram from V. D. Brown, operator for the Great Lakes Radio-Telephone Company at Milwaukee, was delivered to Heselton at 10 o'clock. According to the latter the telegram, which said, "Your messages to the 'Journal' received O. K.," confirms his assertion that his company has made a world's record in the transmission of an overland wireless message.
    Heselton said that his station was in communication with Key West, Fla., Washington, Detroit, and Chicago yesterday afternoon with such success that he determined last night to try to reach Milwaukee. He sent the message to the editor in the latter city because he and Lee de Forest, who is the laboratory expert, chief engineer and a vice-president of the company, are intimate friends. Baxter Morton is the president of the company.