The FCC license search includes the entire file for that license including latitude and longitude or each transmitter location. You then need to get a national topo map program that will do a lat/long search such as DeLorme's Topo USA or, if you are just interested in one state you can purchase USGS topo maps on CD-ROM's one state at a time for about $100 from Topo! by National Geographic.
On some licenses the license applicant listed the name of the peak or electronic site on their application and it is carried over to the license when it is granted. Each license has four tabs to click on to: Main, Administration, Locations, and Frequencies. You can reach the license file using the call sign, FRN (fixed registration number or some such - common to all licenses issued to on entity), county searches, lat/long searches, and several more.