Topband: AM broadcast multiplexing

[Eric Scace K3NA]

I found the 4-station site: Tri-County in Sauk Rapids MN: 7 towers, 4 stations, 
all with different day/night patterns. A report is here 
<http://www.mwpersons.com/articles/2013/four-am-stations/four-stations.html> 
with photos.
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