1540 is designated as a Bahamian-clear, or at least it was for 30+ years or so. It uses two towers from 10 miles south of Nassau, beaming south-southeast to covers most of the islands like Andros, San Salvador, Abaco, Cat Island, Long Island, Inagua, Mayaguana, Eleuthera, Spanish Wells, etc. Because 1540 (ZNS-1) wants to put all of its strength to th Bahamas, and not west or north to the USA, it beams aways from the US. But in doing so, it misses western-northern-northeastern islands like Bimini, Grand Bahamas(Freeport), Berry Islands and Abaco. For those 4 island groups, in 1973, ZNS-3 was set up on 830 on the dial... later moved to 810. Then there was ZNS-2 in Nassau... a second service which no longer exists on AM, but rather FM. Once, I had a superradio while sitting on a beach on San Salvador, 300+ miles away from Nassau, and 1540 bombed in as though the 50kw transmitter was next to me. It was also a great DX'ing spot for hundreds of USA stations. - The 1540 TX site has had its problems.... stolen copper, hurricane taking down part of one of the two towers. The place (TX site) was later guarded by about 10 very ferocious homeless hungry dogs, who were (story i was told) fed daily by a ZNS employee who drove in real quick, dumped the leftover meat, rolled up his window and sped out of there..