AM radio stations changed frequencies. Transmitter sites are known to have been at Young's house, at the Broadway address and from 1927 to 1949 at Superior Boulevard and Falvey Cross Road in St. Louis Park on the grounds of a fox farm. Dr. Young died on April 27, 1945. Later studio locations included Bloomington (two locations), 611 Frontenac Place in St. Paul and, in 2004 at the Clear Channel Communications consolidated offices in St. Louis Park at 1600 Utica Avenue. The transmitter site moved in 1949 to Bloomington at a site that would within a decade overlook I-35W, using a vast 9-tower array. TV experiments In 1933, Dr. Young was granted a license for W9XAT, an experimental mechanical television station that is credited with the first telecast in Minnesota. It is believed that the first transmission of the 45-line system occurred on August 4 of that year, featuring a handshake between WDGY station personality Clellan Card and Minneapolis mayor William Kunze. Later on, 120- or 125-line tests were done on the VHF band. The station pushed the technological limits of mechanical scanning and provided a lot of interesting exercises for WDGY engineers, but Dr. Young never got into regular broadcasts, as he did not want attention from radio hobbyists. The license for W9XAT expired in 1938, partly because mechanical television development was discouraged by that point. After 64 years of dormancy, an amateur radio group in the area acquired the W9XAT call sign in 2002 with the intention of using it for mechanical and narrow-bandwidth TV experiments. Nine years after the 1945 death of Dr. Young, WDGY in 1954 flirted with modern TV, applying for Channel 9 in the Twin Cities. Also applying were competing radio stations WLOL and KEYD. WDGY and WLOL withdrew their applications at the last minute and the new station was awarded to KEYD, going on the air in January 1955, today’s KMSP-TV. Top 40 The station was one of the first stations in the country to program rock and roll music full-time, starting a Top 40 format in 1956. It was then owned by Todd Storz, one of the pioneers in programming to the baby boom generation with some of its music rarely heard on "white" radio stations. Storz's stations were heavy on promotion, headline-grabbing contests, and high-profile disc jockeys, using echo-chamber voice processing. Other Twin Cities station owners resented the attention WDGY received, but