Some of the discrepancies on the FCC Database appear to be due to the "center of the array" varying in the Day and the Night pattern using different towers, with no adjustment being made in the coordinates. Since I can't find the towers yet on any satellite map. I'll draw the towers out on a piece of paper to make more sense of it. It would make more sense to have the other towers in between the two large rows.
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As I noted, check out Google Earth, the LAT/LON I posted is about halfway between the two center towers of the day time array and the June 2014 satellite view is quite clear for all 12 towers.
Before the FAA started getting picky about all towers above 199 feet being registered with exact coordinates, the FCC was apparently kind of sloppy by comparison. There are still many stations whose tower coordinates are significantly off, even if they don't need correction. Remember that 1 second of latitude is about 101 feet, and 1 second of longitude roughly being 101 feet times the cosine of the latitude. Don't get started on the earth being an ellipsoid. Playing around on the fccdata.org website can by zooming in to street level on Open Street Map, will often spot these. They often appear to straddle a road on the map, and it's not the two track the engineers drive on either.
Re- diplexing. While there is now greater flexibility with regard to height (efficiency), spacing distance between towers in an array can be a deal breaker for diplexing. That is, what makes a given pattern at 900 KHz might not make the same pattern at 1500 KHz. There are other factors too, some are not thrilled with close frequency spacing. A bespoke array is best.
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We're talking the easy way to extending the licensing U1 (WRTH Notation). Quick. Go for the STA, then the APP for CP, there as Class D or elsewhere for Class B. 1070-810=260 kHz, very possible to diplex. No new tower necessary.
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