Although the Westinghouse advertisement lists KDKA as still operating on 330 meters, another article on the page noted that, like the other three stations, it had switched to the standard entertainment broadcasting wavelength of 360 meters.

The original scan for this article is located at the Google News Archive site.

 
Pittsburgh Press, December 25, 1921, Additional News Section, page 4:

RADIO  TELEPHONY  APPEALS   TO  ALL  CLASSES.
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    Station KDKA, Pittsburgh's own representative in radio broadcasting and the most famous radio telephone station in the world, has done more to make the radio telephone popular than any other agency of wireless that has ever been operated. Before this broadcasting station was started by the Westinghouse Electric & Manufacturing Co. at East Pittsburgh, Dec. 22, 1920, radio telephony had been a source of amusement to a comparatively few radio amateurs. Today radio receiving is in homes in all parts of the country and locally every part of Pittsburgh has antennae strung up on roof tops or convenient poles showing that the families in this district are hearing KDKA nightly. In the year of operation KDKA, the Westinghouse station brought radio telephony from the point where it was a novelty even among licensed radio operators to the point where it is fast becoming a necessity of the modern household.
    There is only one thing responsible for this enormous growth of radio telephonic interest. Perhaps two. We'll say two because two good reasons can be given. The first one is, and this first one is responsible for the greater number of radio installations, the curiousity of people to hear radio concerts. Music and the human voice coming through the air in such manner that it can be caught by a small receiving set and the entertainment heard. This feat appeals to many people and coupled with the thought that they might have the great pleasure of being able to catch these concerts at will, it is something of a feather in their caps. The other reason is the wide and varied appeal of the Westinghouse concerts. It is, of course, all right to install a radio receiving set and be able to hear the concerts but if one depended upon mere curiousity to hold the interest of radio "fans" it would not be long until the radio telephone would be obsolete, or a plaything of the children. The concerts must have an appeal, they must be good in order to hold and sustain interest in radio telephone.
    For that reason the Westinghouse Electric and Manufacturing Co. has gone to a great deal of pains to broadcast a program that will interest, entertain and instruct every member of the family. Mother, father, brother, sister, the kids, everyone, all can find some part of every program that will appeal to them. People of outlying districts can also find parts of the broadcasting that is directed to them. In other words, every night of broadcasting has been so arranged that one event cannot overshadow all parts of the program.
    KDKA broadcasts regularly late news from the press, crop, stock and weather reports. Athletic contest results where they are scheduled, and such other occurrences as will interest father and big brother providing they are the kind that take interest in things pertaining to the sporting and news world. As we will venture to say that 99 per cent of the modern males are interested in things of this nature, this part of the program should find a hearer and a very interested one at that. About the same time as the news is spoken into the phone Uncle Wiggily gets busy and tells about his continuous escapades. This is for the kiddies. Next the regular concert starts, with music having by far the greater part of it. Mother and sister, even grandmother, take great delight in this, as they also do in the church services which are broadcasted every Sunday. Of course father takes some interest in this also. Father and mother are jointly interested in the grand opera concerts that are sent out every time a star comes to Pittsburgh. During the winter months this broadcasting of opera concerts is going to be a wonderful thing to those people in out-of-the-way places.
    Also on Sundays when the three religious services are sent out, a morning, afternoon and evening service, there is no class of people who will not find an appeal in one of these three services.
    As time goes on the radio telephone invades more and more homes and people by merely turning a bakelite knob can hear such operatic stars as Geraldine Farrar, Mary Garden, Edith Mason, Telmany, Rachmaninoff, Clarence Whitehead, Muratore, or hear speeches by such men as Assistant Secretary of the Navy Theodore Roosevelt, Jr., Secretary of War Weeks, Secretary of Labor Davis, or Secretary of Commerce Herbert Hoover, all of whom at various times have spoken for the radio telephone, the real wonders of radio broadcasting will become apparent.
    The most enlightened men will speak in the humblest of homes as well as the richest. The highest paid operatic stars will sing to the farmer as well as to the bored man about town and his dazzling companion. Those who live in places far from the beaten track will not lose touch with world events, but will be just as close to them as though they lived in a crowded city.
    All these wonders of the radio telephone have come true. The future holds great things in store for the radio enthusiast. In all parts of the country the radio receiving outfit is becoming as much a necessity as the telephone. In a short time, if the radio interest keeps on spreading as rapidly as it has in the past, there will be no home without one.
    All over the country ears are turned toward Pittsburgh and its radio broadcasting station every night, to listen to the station has made radio history. It is famous everywhere, and within Pittsburgh, which is promoting progress by radio as well as progress in other ways.
    Practically a wireless blanket is thrown over the whole eastern half of the United States every evening, for the Westinghouse Co. has four stations now in operation. Station KDKA at East Pittsburgh, Station WJZ at Newark, N J., Station WBZ at Springfield, Mass., and Station KYW at Chicago.
    All these have sprung from the Pittsburgh station, KDKA, the parent of the radio broadcasting of the Westinghouse Co., and, for that matter, the "daddy of 'em all" in the world of radio telephone broadcasting.
Westinghouse broadcasting advertisement