The product is decent and the 10kw signal better than I remember.
The lack of interference helps a lot. There are not too many stations around to interfere with them . The best I can tell there is are on 6 stations US stations on 1680. The nearest on channel is either in Maryland or Illinois. There is a 1700 in Birmingham AL. There still is the man made noise.
IIRC: The above 1600 frequencies were originally “set aside” for stations that were experiencing or causing interference with there existing AM facilities. I believe that they were to run their existing AM station and the expended band station for a brief period then go expended band only. I can only guess these stations can be moved (if the existing COL is covered by another commercial station) just like FMs are moved into bigger markets.
IMHO: it would take a lot of advertising and some kind of unique format hole in any market to make a go of one of these stations without a FM translator. The 10 KW daytime signal with good ground conductivity might make allow for a translator that has class A or better coverage. Atlanta’s ground conductivity is poor so I doubt if 1690 could go past the 25 mile translator coverage rule.