Saturday, April 25, is the 28th International Marconi Day (IMD), organized by the Cornish Radio Amateur Club in Cornwall, UK. IMD recognizes the anniversary of the birth of wireless pioneer Guglielmo Marconi, born on April 25, 1874. Participating stations are expected to be on the air during the period 0000 to 2400 UTC (ie, starting the evening of Friday, April 24, in US time zones). The occasi…