I noticed the winning AM bid from R9-114150 / La Rancherita del Aire S.A. de C.V while glossing over the IFT file you posted.
Cool. XEMU with its low frequency carries deeply into the US during the day.
XEMU had a close relationship with our departed WTFDA member Joe Gragg.
I was quite pleased the night I heard XEMU in Michigan, including a full ID, and the La Rancherita del Aire name.
Comparing Sporadic-E skip to skip on the AM and shortwave bands is like comparing apples and oranges.
Comparing tropo to skip is like comparing apples and bacon cheeseburgers.