Interesting regarding simulcasting...though I wonder if 102.1 and 105.3 on the NH seacoast get away with it? (Hampton NH/ Kittery ME, not so far apart?)
From Oct of 2004 through Dec of 06, what was then WKOX 1200 and WXKS 1430, from what was then Clear Channel, both ran Air America.Later WKOX boosted power and changed COL from Framingham to Newton. In early 2010* IIRC, CC/iHR swapped call letters and 1200 went conservative talk as Rush Radio.That lasted a couple years.
By 2015, WRKO wanted to dump Rush.WMEX wasn't interested in Rush so on the same day Kuhner went to noon on 680, iHR changed 1430 to conserv talk with some Fox Sports.
So if iHR wants to at least temporarily do conserv talk on 1200 and 1430, the signals overlap enough that it breaks the rules.If so, then iHR could throw something else on 1430 temporarily..
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*---How I recall the year: Ted Kennedy died in Aug of 09.Special election to replace him was in Jan of 2010.Not long after, there were rumblings about 1200 going conserv talk, which they did, a couple months later.Brown won the special election but lost in 2012 to Warren, who's up for re election this year.