Through the magic of MySQL 5.0 and ancient Greek mathematics (“stolen” from either the Nubian or pre-Islamic Arab culture), Streaming Radio Guide has a brand new feature for the radio geeks and the incurably curious (and you know who you are!)
If you get the page listing a station’s information (and schedule if we maintain one), there is a new link titled “Transmitters close to [station]”. That page can be reached by doing a “station search” or several other ways (new links coming soon where it makes sense). Look for the 
Clicking on “Transmitters close to…” will list all FCC licensed radio and TV transmitters (AM, FM, LPFM, FM Translators, TV, TV translators, boosters, LPTV/Class A or backup transmitters) within a 35 mile radius of the station, who owns the station, its licensed power – and a link to Google Maps so you can see approximately where the transmitter tower is located.
You can also click on the channel or frequency and show only stations that share the same frequency (over a much longer distance). As I keep tweaking the features, I may come up with other neat ideas, so the list may change while you’re using it (or break temporarily).
Interestingly (if you’re a geek), the towers are slightly “off” in Google Maps/Earth. The reason – there are threee main ways of expressing coordinates in North America – NAD-27 (based on calculations and surveys done in 1866 when the USGS surveyed the entire United States – that’s what the FCC uses), the much more accurate NAD-83 done in 1983 (still only concerned about North America), and the WGS84 – the World Geodetic System. Google Earth covers more than just the United States, so Google uses WGS84 for their coordinates.
The earth’s plates themselves are always shifting, especially after a major earthquake – so GPS satellites and ground stations pick up those changes. We humans like to think of the ground as something that is permanent and never moves, but that’s not the reality. After all, Africa and South America used to be next to each other 100 million years ago.
If you’re looking for an 800 foot high TV tower, NAD27 gets you in the neighborhood (FCC data does not include fractions of seconds)…., NAD83 or WGS84 gets you within a few feet – but if you want to steer a guided missile in through a window 1000 miles away, you need more accurate measurements or image recognition software to “see” a window.
There is no easy way to transform between those two systems – since the inaccuracy was based on accumulations of small human errors and different ways of describing the shape of the Earth mathematically. Unless Google incorporates a way to transform NAD27 to WGS84 inside their products, there is no reasonable way to correct this error. So I can get you to the neighborhood, the rest is up to your eyes.
Intererestingly, the FAA uses NAD 83 for airports (not a big surprise0 – which means when the FCC needs to discuss radio towers near airports, they have to do a NAD27<->NAD83 conversion for all of their measurements.
See, scientists are wrong – longitude and latitude are really only a theory – and the Earth really is only 10,000 years old!
Another small detail – some radio stations use different transmitters during the day and at night (only AM?) – because at night stations generally need more than one antenna to create a directional signal and operate at much less power. Where a station uses different transmitter locations, the antenna being shown is the Daytime antenna.