Here is the reason for digital and analog ,
http://forum.tvfool.com/showthread.php?t=695 . I can tell that you have been reading recent posts. The rules are that we need to find out what the situation is so we can make recommendations. We do our best to cut through the clutter with the result being that you have you have excellent Tv reception. The default antenna height is 10 feet. Please make a radar plot with the antenna at 25 feet high. Are you in a , house , condo , apt. , mobile home , motor home , etc.?? How many Tv's will be connected?? Is there coax wiring in place now??