Dan Strassberg wrote: >In 1931, when WSUN St Petersburg became the first directional station in the >US, it and WFLA Tampa shared time on 620. Because much of the path from >Tampa Bay to Milwaukee is over salt water, the station interfered with WTMJ I don't know what map you were using, but on mine there's maybe 200 mi of salt water and 1000 mi of dry land.