Photograph of radio station 8XK (antenna with counterpoise), from "Amateur Radio Stations: 8XK Pittsburgh", QST magazine, September, 1920, page 32
<p>QST magazine, September, 1920, page 32, "Amateur Radio Stations: 8XK Pittsburgh", <br></p>
(Life time: n/a)
1920-09
<p><b>Original publication</b>: QST magazine<br></p>
<b>Immediate source</b>: QST magazine