“Tchum Shabbos wasnt an issue at Belmont. There are houses on the other side of the Cross Island certainly less than a mile from the track and there are houses directly to the South of Belmont an Im sure to the east as well (I drive on the Cross Island alot so I am familar with that area as seen from the Cross Island)”
So a mile is the shiur for t’chum? This is radically new interpretation of halacha. 70 Amos is the determining measure, not a mile.