Just for geeks, the FM Fool website is. Nonetheless, it is a cool site to look at and can be used as a tool to find out what stations are available in any certain area. Using the FCC database and terrain profile, it will print out a radar plot of all signals for any address in the US:
This plot is for my house based on a 30-foot outdoor antenna and includes all FM stations that are even marginally receivable. We kind of live off to the side of nowhere.
The transmitter database was last updated on July 5, 2012. Longer bars represent stronger signals. Details about each transmitter are provided in the table to the right of the plot.
This is a companion site for the TV Fool website. If you want to see what off-air TV signals are available at any given location, this is the way to do it. A few years ago, I was thinking of getting rid of the Cable TV in favor of off-air reception. Unfortunately, there are only a few off-air TV channels available at my house. Therefore, I threw out the TV. Problem solved.