DanStrassberg said:
Did WLIB really have multiple towers when it broadcast from the Queens site? It was 1 kW ND L-WOWO at that time, but it could have been using a long-wire, and would therefore have had two towers. I remember seeing the WLIB Queens site from--I believe--the Tri-Borough Bridge back in the '40s but I can't recall how many towers there were.
I think, now that you mention it, that the WLIB site was just one tower at that point. I checked out the remains of the site a few years ago. The transmitter building is long gone, but the pier where the tower sat was still sitting there, just a concrete platform with some debris where the tower base would once have been.
Oh, and in the '40s WWRL transmitted from a single tower in the back yard of what looked like an ordinary residence in the Woodside section of Queens. WWRL was running 250W-U. I believe it was a relatively rare Class IV on a Class III channel. Despite WWRL's higher frequency, lower power, and site farther from salt water, I don't recall WWRL's signal in the Bronx on 1600 being noticeably worse than WLIB's or WNYC's.
WWRL was uniquely affected by the NARBA shifts. Before 1941, WWRL and WCNW were sharing time on 1500, which was a Class IV channel. Under the "table method" that shifted most everything from 1070 kHz and above upward by 30 kHz, that "graveyard" 1500 channel would have become 1530, but the class III channels back then ended at 1450, with 1460-1470-1480-1490 occupied by higher-class signals. Instead of continuing that pattern, which would have made 1490-1500-1510-1520 into clear channels and moved the 1500 "graveyarders" to 1530, NARBA moved the 1500 stations to 1490 and created a new contiguous block of clear channels from 1500-1530. (1540, 1550, 1570 and 1580 were foreign clears, 1560 was a US clear and 1590 and 1600 became class III regional channels as part of the expansion of the AM band upward.)
But in New York City, that created a problem: WHOM was a class III regional on 1450 that moved by table to 1480, and so WWRL/WCNW couldn't go to 1490 with the rest of their 1500 brothers and sisters. What to do? The FCC relocated WCNW and WWRL to the top of the dial, 1600. WCNW didn't stay long - it applied to become a daytimer on 1190, a frequency that opened up when WGBS/WINS relocated from 1180 to 1010, and after a month or so of sharing time on 1600 with WWRL, WCNW moved down to 1190 and soon changed calls to WLIB.