While the spectrum auction and repack could raise challenges, most multicast network players say they’re bullish on the business, especially with the likely adoption of ATSC 3.0. Diginets keep adding affiliates and expanding coverage and the top ones have begun attracting general market advertising. This is Part 1 of a four-part special report on multicasting. Parts 2 and 3 also appear today. Part 4, running Thursday morning, will focus on the technology of compression and channel sharing. You can read the other stories here.