Boston downtown radio towers (1956)

[Linc Reed-Nickerson]

I'll have to see if I can find an old aeronautical sectional chart to 
confirm, but I believe that is the old Boston Low Frequency Radio Range 
station.  Would have been between 200 and 500kHz.

Last CONUS radio ranges were gone by 1970, last one I remember was at 
NAS Brunswick, ME.  The range stations were CW A or N if you were off 
course, a solid tone if you were on one of the 4 courses.

Interesting piece of aviation  history.

Bit of trivia... Until about 1960 the Instrument Landing System outer 
marker beacon at Hanscom was on 512 kHz, second harmonic (1024) could be 
heard over WBZ withing about a mile of the station, CW call sign was BED.

Linc