Open the TVFool Signal Locator here:
http://www.tvfool.com/index.php?opti...pper&Itemid=29
Click on the radio button marked "Coordinates"
In another window, open:
https://maps.google.com/
Switch to Satellite View if it isn't already. Now, use the search bar to enter your address. Drag and zoom so that you can see your home. Right click on the exact location you want to mount the antenna. On the resulting menu, click "Directions from Here". On the left with be An A) and B) with a series of numbers next to A).
The first set is the exact Latitude of the antenna location. The second set is the exact Longitude. Either cut and paste, or copy these two numbers into the proper fields on the TVFool form. In North America, be sure that your Longitude is Negative.
I was amazed using this method just how much a difference I got in my report just from one end of the house to the other. There was also a significant difference between mounting a J-pole to the side of the house and mounting a 10' mast from the peak. Be sure to estimate your altitude as accurately as possible.
Enjoy.