With the exception of NBC, the major TV networks are available to her, and Global from Canada carries most NBC programs. The OP also seems particularly interested in FOX, which is available from the local mountaintop.
Tower Guy's observation about the balun transformer connecting the coax cable to the preamp is spot-on: I am sure that it is blocking the DC power from the preamp power supply, assuming that a power supply is even present.
I believe that the smart move here is to replace the existing preamp with a new Channel Master Titan 7777, and replace the twin-lead cable running from the antenna to the preamplifier input with a new short length of coaxial cable. Its possible that the antenna terminals on the antenna are old and corroded, in which case we may have trouble mounting a new antenna balun on the existing antenna.
The upshot of all this is that we definitely need to replace the preamplifier, and we MAY need to replace the antenna if the place where the antenna wire attaches to the antenna is badly corroded.
If we can use the existing antenna, we need to buy a weather-resistant balun like a Channel Master 0089/0090 to connect new coaxial cable to the new preamplifier. New preamplifiers usually use coaxial cable both in and out of the preamplifier. You will also need to install the preamplifier power supply inside the house before connecting it to the antenna connector on the TV set. Here is a link to an instructional video about the Channel Master Titan 7777
http://www.hdtvantennalabs.com/forum...eamp-t853.html
If we determine that the old antenna can no longer be used , or you simply want a better antenna than what you already have, consider an AntennasDirect XG-91 UHF antenna, which is probably the best, moderately-priced UHF antenna currently available: it can be bought cheaply from SolidSignal.com
http://www.solidsignal.com/pview.asp...u=853748001910
And here is the preamplifier:
http://www.solidsignal.com/pview.asp...ku=02057207774
With the combination of these two components, plus a short length of coax cable to run between the antenna and the preamplifier, you should be able see all of the local TV stations from the mountaintop clearly.
Remember to be sure that the antenna is aimed at 314 degrees plus or minus a few degrees, as measured by your compass.